2003
Avian food selection with application to pesticide risk assessment: Are dead and desiccated insects a desirable food source? Stafford, Jennifer M.; Brewer, Larry W.; Gessman, James A. Environmental Toxicology and Chemistry, Jun. 2003, v. 22 (6), p. 1335-1339. ISSN: 0730-7268.
NAL call no: QH545.A1E58
Descriptors: food selection, dead insects, pesticides, risk assessment, field study, orchard, corn field, laboratory diet study, preferences.
Abstract: Past evaluations of pesticide exposure have been conducted with substantial uncertainty regarding avian consumption of contaminated food items. One question is whether birds consume invertebrates that are killed by a chemical application and that may present an increasing chemical concentration as they dessicate. We addressed the research question in two phases. First, a laboratory study was conducted in which wild-caught birds were individually offered three food choices, i.e., live, fresh-dead, and desiccated insect larvae. Second, these same food choices plus live, fresh-dead, and desiccated crickets were presented in study plots in two agricultural crops, i.e., a cornfield and an orchard. The experimental food items were monitored with videography equipment to determine their fate and to compare laboratory and field results. Laboratory results showed that birds have a strong preference for live and fresh-dead prey over desiccated prey, with live prey taken before fresh-dead prey in most trials. The field study revealed a similar preference for live prey over desiccated prey, with preference for fresh-dead prey intermediate to the two other types.
Hand rearing of pet birds – feeds, techniques and recommendations. Wolf, P.; Kamphues, J.; Liesegang, A. (ed); Riond, J.L. Journal of Animal Physiology and Animal Nutrition, 2003, v. 87 (3-4), p. 122-128. ref.
NAL call no: 389.78 Z3
Descriptors: feeds, techniques, pet birds, hand rearing, budgerigars, lovebirds, nutrient requirements, proteins, minerals, sulphur, amino acids.
Abstract: The comparisons of the contents of nutrients determined in commercial hand rearing diets with the nutrient requirements of growing budgerigars and lovebirds estimated by the factorial method revealed satisfactory protein, lysine and arginine concentrations. Regarding sulphur amino acids, a number of products showed marginal methionine and cystine contents. Mineral contents generally met all requirements and were even excessive in some cases. Ultimately, the results gained in this study demonstrate that nestlings’ substantial requirements for sulphur amino acids for plumage development are often underestimated, while their calcium requirements in connection with bone mineralization are frequently overestimated. The primary obstacle to successful hand rearing, however, probably lies not so much in energy and nutrient contents, but rather – as revealed by first results of feeding trials with lovebirds – in the passage of the suspended diet through the gastrointestinal tract (e.g. crop disorders) and/or errors regarding feed quantities and feeding frequency.
Investigations on feathering, feather growth and potential influences of nutrient supply on feathers’ regrowth in small pet birds (canaries, budgerigars and lovebirds). Wolf, P.; Rabekl, N.; Kamphues, J.; Liesegang, A. (ed); Riond, J.L. Journal of Animal Physiology and Animal Nutrition, 2003. v. 87 (3-4), p. 134-141. ref.
NAL call no: 389.78 Z3
Descriptors: feather growth, nutrition, regrowth, small birds, feather regeneration, sulphur, amino acids, minerals, vitamins.
Abstract: The aim of this study was to quantitate feathering in several companion birds. Besides the ratio of feathers to whole body mass, feather length as well as feather weight were of interest. Furthermore, data on feather loss and growth rates were estimated. In general, it could be observed that the proportion of feathers relative to body mass varied between 14 (canaries) and 7.4% (lovebirds). Feather losses (outside the moult period) amounted to an average of 6.66 (canaries), 8.98 (budgerigars), and 8.43 (lovebirds) mg.bird/day respectively of 37 (canaries), 20 (budgerigars), and 17 (lovebirds) mg.100 g body weight/day (values of interest in calculating of protein requirements for maintenance). In canaries, the average growth rate of the developing feathers amounted to 2 mm/day. In contrast to the onset of feather regeneration, the growth rate of new feathers leaving the follicle was not influenced by the supplements used here. The regeneration period (first measurable feather growth) of a plucked pinion can be used as an indicator and objective parameter to test potential nutritional influences. Parallel to the improvement of nutrient supply the rates of feather losses and also replacement increased, whereas the rates decreased when seed mixtures without any addition of minerals, sulphurous amino acids, and vitamins were fed.
Lipolytic and metabolic responses to glucagon in fasting king penguins: Phase II vs. phase III. Bernard, S.F.; Thil, M.A.; Groscolas, R. American Journal of Physiology, 2003. V. 284 2(2), R444-R454. ref. ISSN: 0002-9513.
NAL call no: 447.8 AM3
Descriptors: glucagon, fasting king penguins, responses, fuel metabolism, plasma concentrations.
Abstract: This study aims to determine how glucagon intervenes in the regulation of fuel metabolism, especially lipolysis, at two stages of a spontaneous long-term fast characterized by marked differences in lipid and protein availability and/or utilization (phases II and III). Changes in the plasma concentration of various metabolites and hormones, and in lipolytic fluxes as determined by continuous infusion of [2-3H]glycerol and [1-14C]palmitate, were examined in vivo in a subantarctic bird (king penguin) before, during, and after a 2-h glucagon infusion. In the two fasting phases, glucagon infusion at a rate of 0.025 ug.kg-1.min-1 induced a three- to fourfold increase in the plasma concentration and in the rate of appearance (Ra) of glycerol and nonesterified fatty acids, the percentage of primary reesterification remaining unchanged. Infusion of glucagon also resulted in a progressive elevation of the plasma concentration of glucose and beta-hydroxybutyrate and in a twofold higher insulinemia. These changes were not significantly different between the two phases. The plasma concentrations of triacylglycerols and uric acid were unaffected by glucagon infusion, except for a 40% increase in plasma uric acid in phase II birds. Altogether, these results indicate that glucagon in along-term fasting bird is highly lipolytic, hyperglycaemic, ketogenic, and insulinogenic, these effects, however, being similar in phases II and III. The maintenance of the sensitivity of adipose tissue lipolysis to glucagon could suggest that the major role of the increase in basal glucagonaemia observed in phase III is to stimulate gluconeogenesis rather than fatty acid delivery.
Methods to determine metabolizable energy and digestibility of feed ingredients in the domestic pigeon (Columba livia domestica). Sales, J.; Janssens, G.P. Poultry Science, Sept. 2003, v. 82 (9), p. 1457-1461. ISSN: 0032-5791.
NAL call no: 47.8 AM33P
Descriptors: feed ingredients, digestibility, metabolizable energy, methods, corn, peas, intake, excreta output.
Abstract: The influence of length of excreta collection period (1, 3, 6, 10, 14 d) and prefeeding protocol (7 d either individual feeding in collection cages or group feeding in housing cages) on AMEn, nitrogen retention (NR), and apparent DM, organic matter and ether extract digestibility of corn and peas were evaluated in domestic pigeons (Columba livia domestica). In addition, the use of internal markers [acid-insoluble ash (AIA) and acid detergent lignin (ADL)] to determine AMEn. NR, and apparent digestibility was compared with the method of measuring total feed input ands excreta output. A quadratic (y = a + bx + cx2) trend in the CV for AMEn, NR, and apparent digestibility coefficients found over collection periods with corn presented evidence that excreta collection for a period of 3 d will produce a CV of 5% less than the minimum CV. Although no trend could be detected in CV for peas, a 3-d excreta collection period resulted in relatively low variation. Both AIA and ADL, when used as internal markers, resu lted in AMEn, NR, and digestibility values below (P<0.05) those obtained with total collection with corn. However, values between markers were comparable (P>0.05) for all components evaluated. The ADL was unsuccessful as a marker with peas. Group prefeeding of pigeons in housing cages resulted in lower feed intake, excreta output, NR, and apparent digestibility than when birds were adapted individually to collection cages. This study presents evidence that the method of measuring total feed intake and excreta output for a period of 3 d, with individual adaptation of birds to collection cages, resulted in the most reliable values for AMEn, NR, and apparent digestibility of DM, organic matter and ether extract of feed ingredients in pigeons.
Nutrition and its interaction with reproductive processes. McEvoy, Tom G.; Robinson, John J. Conservation Biology Series (Cambridge), Reproductive Science and Integrated Conservation, 2003, 8: p.42-56. Holt, William V.; Pickard, Armanda R.; Rodger, John C.; Wildt, David E. (eds.). Cambridge University Press, N.Y, N.Y. ISBN: 0521011108 (paper); 0521812151 (cloth).
NAL call no: QL676.5 C54
Descriptors: bird husbandry, nutrition, reproduction, egg laying species.
Osmoregulation in an avian nectarivore, the whitebellied sunbird Nectarinia talatala: Response to extremes of diet concentration. Fleming, P.A.; Nicolson, S.W. The Journal of Experimental Biology, Jun. 2003, v. 206 (Pt, 11), p. 1845-1854. ISSN: 0022-0949.
NAL call no: 442.8 B77
Descriptors: diet concentration, nectarivores, osmoregulation, water, nectar, sucrose solutions at various concentrations.
Abstract: Water intake of nectarivores is intrinsically linked to nectar concentration. Osmoregulation in whitebellied sunbirds Nectarinia talatala (body mass 9.3 + 0.1 g, mean + S.D., N=7), was examined by feeding them sucrose solutions, equivalent to extreme diet concentrations (0.07 - 2.5 mol l(-1) sucrose; 2-65% w/w), with and without supplementary drinking water. Total water gain was 33-515% of body mass daily. Cloacal fluid (CF) volume increased with diet dilution from 0.4% to 309% of body mass while increases in evaporative water loss (obtained by difference) were also recorded. Osmolality of CF demonstrated the largest scope yet recorded for a bird and was significantly correlated with water flux: mean values were 6-460 mosm kg(-1) H(2)0 (minimum 3, maximum 1900 mosm kg(-1). When supplementary water was provided, its consumption by birds fed concentrated diets (2.5 mol l(-1) sucrose) led to a dramatic reduction in CF osmolality, from 461+ 253 to 80 + 119 mosm kg(-1) fluid. Sunbirds maintained energy balance on sucrose diets varying tenfold in concentrations, from 0.25 to 2.5 mol l(-1); however, on extremely dilute diets (0.07 and 0.1 mol l(-1) sucrose, lower than natural nectar concentrations) their inability to maintain energy balance was probably due to excess preformed water. Total osmotic excretion and concentrations of Na(+) and K(+) increased with high water fluxes, and are a possible physiological constraint for nectarivorous birds on artificial dilute diets devoid of electrolytes. Even low electrolyte levels in nectars may be adequate to replace these losses, but other physiological limitations to the intake of dilute nectars are increased energetic costs of solute recovery, increased heat loss and interference with digestive processes. Sunbirds therefore deal with sugar solutions spanning the range of nectar concentrations by shutting down water excretion on concentrated diets, or on dilute diets, by producing extremely dilute CF with some of the lowest solute concentrations recorded.
2002
Estimated nutrient content of diets commonly fed to pet birds. Hess, L.; Mauldin, G.; Rosenthal, K. Veterinary Record, 2002, v. 250 (13), p. 399-404. ref. ISN: 0042-4900.
NAL call no: 41.8 V641
Descriptors: dietary surveys, energy, food consumption, nutrient requirements, seeds, formulated feeds, human foods, owner survey.
Abstract: 135 pet bird owners in New York city (New York, USA) were surveyed by questionnaire between July 1996 and May 1997, to determine their birds’ weekly food consumption. The birds were divided into 6 food groups on the basis of the amounts of seeds, formulated products and human food they consumed. The formulated products and seeds were analysed for their nutrient content by 2 independent laboratories; the nutrient content of the human foods was obtained from a standard nutrition reference, and each bird’s nutrient intake was estimated. The dietary content of individual nutrients was then compared with the estimated maintenance requirements for pet birds. Birds consuming less than approximately 50% of their diets as formulated products had inadequate intakes of vitamins A [retinol] and D3 [cholecalciferol], and calcium. Diets high in human food were low in protein, energy, vitamins and minerals. Diets high in seed were excessive in fat and deficient in vitamin A and D3 ands calcium.
Introduction to basic husbandry, handling and nutrition of caged birds. Keeble, E.J. Irish Veterinary Journal, 2002, v. 55 (5), p. 232-236. ref. ISSN: 0368-0762.
NAL call no: 41.8 IR4
Descriptors: animal feeding, animal nutrition, diets, aviary birds, budgerigars.
Abstract: This paper provides information regarding the proper housing, welfare, nutrition and handling of budgerigars, parrots, canaries and other commonly kept pet birds.
2001
Adult cockatiels (Nymphicus hollandicus) metabolically adapt to high protein diets. Koutsos, E.A.; Smith, J.; Woods, L.W.; Klasing, K.C. Journal of Nutrition, 2001, v. 131 (7), p. 2014-2020. ISSN: 0022-3166.
NAL call no: 389.8 J82
Descriptors: protein intake, urea, toxicity, adaptation, diets, liver, essential amino acids, males, amino acid catabolism, nitrogen excretion.
Abstract: To determine the ability of cockatiels (Nymphicus hollandicus), a granivorous avian species, to adapt metabolically to high dietary protein levels, adult males (n=26) were fed isocaloric diets containing 11, 20, 35 or 70% crude protein (CP) for 11 mo. Throughout the trial, body weight and breast muscle weight were maintained by 11, 20 or 70% CP. The 35% CP diet resulted in significantly greater body weight (P<0.05) and whole body lipid content (P<0.05) compared with the 11% diet. The 20% diet resulted in greater breast muscle mass compared with 70% CP (P<0.05). Activity of the amino acid catabolic enzymes alanine aminotransferase, aspartate aminotransferase and arginase as well as the gluconeogenic enzyme phosphoenolpyruvate carboxykinase were significantly increased with 70% CP (P<0.05). Serum essential amino acids, urea and uric acid were also increased with 70% CP (P<0.05), but the magnitude of their increase was similar to that found in omnivorous chickens fed a similar diet. There was no evidence of visceral gout, articular gout or renal pathology; however liver lesion severity, and specifically liver lipogranuloma severity, was significantly increased above 11% CP (P<0.05). We conclude that cockatiels are able to up-regulate enzymes for amino acid catabolism as well as mechanisms for nitrogen excretion in response to high dietary protein levels, and that high dietary protein levels are not associated with kidney dysfunction in this avian species.
The apparent metabolisable energy of diets with different sources of fibre when fed to emus, ostriches and cockerels. Farrell, D.J.; Sales, J.; Perez-Maldonado, R.; Kent, P.; Ahermer, M.; Mannion, P.F. EAAP publication 103; Proceedings of the 15th Symposium on Energy Metabolism in Animals. Snekkersten, Denmark. Sept. 11-16, 2000. Chwalibog, A.; Jakobsen, K. (eds.). Publisher: Wageningen, Wageningen (Netherlands), 2001, 487 pp. Chapter pagination: 141-143. ISBN: 9074134831.
Descriptors: emus, ostriches, cockerels, digestibility, dietary fibers, energy metabolism.
Captive diets alter egg yolk lipids of a bird of prey (the American kestrel) and of a galliforme (the red-legged partridge). Surai, P.F.; Speake, B.K.; Bortolotti, G.R.; Negro, J.J. Physiological and Biochemical Zoology, 2001, v. 74 (2), p. 153-160. ref. ISSN: 1522-1005.
NAL call no: QL1.P52
Descriptors: diets, egg composition, egg yolk, fatty acids, lipids, study, increase in polyunsaturate ratio, fatty acid profile, dietary.
Abstract: The salient feature of fatty acid profile of kestrel eggs collected in the wild was the very high proportion of arachidonic acid (15.2%+ 0.7% of fatty acid mass, n=5) in the phospholipid fraction of the yolk. Kestrels in captivity fed on day old chickens produced eggs that differed from those of the wild birds in a number of compositional features: the proportion of linoleic acid was increased in all the lipid fractions; the proportion arachidonic acid was increased inn yolk phospholipid and choesteryl ester; the proportion of alpha-linolenic acid was decreased in all lipid classes, and that of docosahexaenoic acid was decreased in phospholipid and cholesteryl ester. Partridge eggs from the wild contained linoleic acid as the main polyunsaturate of all the yolk lipid fractions. Captive partridges maintained on a formulated diet very rich in linoleic acid produced eggs with increased levels of linoleic, arachidonic, and –6 docosapentaenoic acids in the phospholipid fraction; reduced proportions of alpha-linoleic acid were observed in all lipid classes, and the proportion of docosahexaenoic acid was markedly reduced in the phospholipid fraction. Thus, captive breeding of both the kestrel and the partridge increases the n-6/–3 polyunsaturate ratio of the yolk lipids.
Diet preferences of warblers for specific fatty acids in relation to nutritional requirements and digestive capabilities. Mcwilliams, S.R.; Kearney, S.B.; Karasov, W.H. American Zoologist, Dec. 2001, v. 41 (6), p. 1523. ISSN: 0003-1569.
NAL call no: 410 AM3
Descriptors: behavior, metabolism, nutrition, diet, food intake, long-chain saturated fatty acids, yellow-rumped warblers, Dendroica coronata.
Abstract: During energy-demanding periods of the annual cycle such as migration or during cold days in winter, birds store fat comprised mostly of 16- or 18-carbon unsaturated fatty acids. In such situations, birds may feed selectively on foods with specific fatty acids that enable efficient fat deposition. We offered wild-caught yellow-rumped warblers (Dendroica coronata) paired choices between semi-synthetic diets that differed only in their fatty acid composition. Warblers strongly preferred diets containing long-chain (18:1; carbon atoms:double bonds) unsaturated, unesterified fatty acids to diets containing long-chain saturated, unesterified fatty acids (18:0) and they preferred diets containing mono-unsaturated fats (18:1) to diets containing poly-unsaturated fats (18:2). The preference for diets containing long-chain unsaturated fatty acids to diets containing long-chain saturated fatty acids was consistent in birds tested one week after capture at 2°C, one month after capture when cold-acclimated (1°C), and six weeks after capture at 21°C. Birds acclimated to a diet with 50% of the fat comprised of unesterified stearic acid (18:0) lost mass and reduced their food intake when we reduced ambient temperature from 21°C to 11°C over three days. We concluded that especially in energy-demanding situations there are limits to the yellow-rumped warblers ability to assimilate some long-chain saturated fatty acids and that this digestive constraint can explain in part why yellow-rumped warblers prefer diets containing long-chain unsaturated fatty acids to diets containing long-chain saturated fatty acids.
Early nutrition causes persistent effects on pheasant morphology. Ohisson, T.; Smith, H.G. Physiological and Biochemical Zoology, 2001, v. 74 (2), p. 212-218. ref.
NAL call no: QL1.P52
Descriptors: dietary protein, growth rate, ontogeny, size, tarsus, agricultural pesticide effects, experimental study.
Abstract: Differences in growth conditions during early ontogeny have been suggested to cause permanent effects on the morphology and quality of birds. Yearly variation in growth conditions could thus result in morphological and quality differences between cohorts. In this study, we investigated the effect of small differences in the dietary protein content of captive ring-necked pheasants (Phasianus colchicus) during their first 8 wk posthatching. An experimental increase of the proportion of dietary protein during the first 3 wk of life accelerated growth, whereas a similar manipulation during the following 5 wk had only a limited effect. Compensatory growth during the postexperimental period equalized the size of the chicks from different experimental treatments. However, a difference in tarsus length resulting from experimental treatment during the first 3 wk remained into adulthood. Furthermore, the protein content of the diet during the first 3 wk had an effect on the degree of fluctuating asymmetry in tarsus length, suggesting persistent effects on the quality of birds. The results of this study may explain sized differences between cohorts that exist in pheasants and may also provide a link between the use of pesticides in agriculture and population effects on pheasants.
Effect of age on seed digestion in parrots (Amazona aestiva). Vendramin, Gallo M.; Pessutti, C.; Pezzato, A.C.; Vicentini, Paulino M.L.M. Physiological and Biochemical Zoology, 2001, v. 74 (3), p. 398-403. ref. ISSN: 1522-2152.
NAL call no: QL1.P52
Descriptors: age, digestibility, fiber, maize, seeds, soybeans, sunflower seeds, young, adults, gastrointestinal microflora.
Abstract: The objective of this study was to compare the capacity of adult (more than 3 yr old) and young (less than 1 yr old) true parrots (n=12 in each group) to digest seeds that are normally included in their diet in captivity, particularly soyabean, sunflower, and corn. All the seeds were offered for 5 d with an interval of 15 d between different diets. The seeds of soyabean and corn were boiled for 15 min and soaked in water at ambient temperature for 12 h before being fed to the birds. There were no differences in the digestibilities of crude protein and fats (ether extract) among the animals, but the digestibilities of dry matter and crude fibre by the adult animals were higher than those of the young ones. The digestibility of carbohydrates (nitrogen-free extract) by adult birds was higher only for sunflower seeds. It is concluded that the capacity of parrots to digest fibre may change according to the age of the animal. Since the digestion of fibre depends on the action of microorganisms, these results suggest that the colonization of the gastrointestinal tract is delayed or very slow in young parrots.
Feeding behaviour of free-ranging penguins determined by oesophageal temperature. Charrassin, J.B.; Kato, A.; Handrich, Y.; Sato, K.; Naito, Y.; Ancel, A.; Bost, C.A.; Gauthier, Clerc M.; Ropert, Coudert Y.; Maho, Y. le; le Maho, Y. Proceedings of the Royal Society of London, Series B, Biological Sciences, 2001, v. 268 (1463), p. 151-157. ref. ISSN: 0962-8452.
NAL call no: 501 L84B
Descriptors: feed intake, temperature related to prey ingestion, esophagus, stomach, Aptenodytes patagonicus.
Abstract: Using oesophageal temperature, we present here a new method for detecting the timing of prey ingestion in free-ranging sea birds, and, to our knowledge, report the first data obtained on king penguins (Aptenodytes patagonicus). In birds ashore, which were hand-fed 1-15 pieces of fish, all meal ingestions were detected with a sensor in the upper oesophagus. Detection was poorer with sensors at increasing distances from the beak. At sea, slow temperature drops in the upper oesophagus and stomach characterized a diving effect per se. For the upper oesophagus only, abrupt temperature variations were superimposed, therefore indicating prey ingestions. We determined the depths at which these occurred. Combining the changes in oesophageal temperatures of marine predators with their diving pattern opens new perspectives for understanding their foraging strategy, and, after validation with concurrent applications of classical techniques of prey survey, for assessing the distribution of their prey.
Feeding of ostriches (Struthio camelus). Arsian, C.; Inal, F. Kafkas Universitesi Veteriner Fakultesi Dergist, 2001, v. 7 (2), p. 229-235. ref. ISSN: 1300-6045.
Descriptors: animal anatomy and morphology, nutrition, nutritional physiology.
Abstract: The following review elaborates on features of the gastrointestinal tract and nutrient requirements of ostriches (Struthio camelus). Suggested feeding regimes are evaluated.
Food requirements of wild animals: Predictive equations for free-living mammals, reptiles and birds. Nagy, K.A. Nutritional Abstracts and Reviews, Series B, Livestock Feeds and Feeding. 2001, v. 71 (10), p. 21R-32R. ref. ISSN: 0309-135X.
Descriptors: animal nutrition, bioenergetics, feed intake, nutrient requirements.
Abstract: Feeding rates (intake of both dry matter and fresh matter) by 79 species of animals, 95 species of birds and 55 species of reptiles were estimated from doubly labeled water-based measurements of field metabolic rate on each species. Allometric (scaling) regression analyses of log 10-transformed feeding rates vs. body mass yielded statistically significant relationships for 90 different taxonomic, dietary and habitat groupings of species. The resulting exponential equations can be used to predict the daily food requirements needed to maintain energy balance for free-living mammals, birds and reptiles with an average error of about 5% to 60%, depending on the group. The ability to predict feeding rates of terrestrial vertebrates should be useful to zoo keepers, animal nutritionists, veterinarians, pet hobbyists, wildlife zoologists, game managers, range biologists, preserve directors and planners, conservationists, paleontologists and ecosystem modelers. These equations should underestimate somewhat the feeding rates of free-living animals that are growing, reproducing or storing up fat. The equations probably overestimate the feeding rates of captive wild animals (e.g. in zoos) and of free-ranging animals during some phases of their lives when they either do not or cannot feed normally.
Fueling around. Sugar junkies of the bird world. Jackson, Sue; Nicolson, Susan. Africa Birds and Birding, Jun./Jul. 2001, v. 6 (3), p. 32-35. ISSN: 1025-8264.
Descriptors: nutrition, diet, dietary requirements, feeding behavior, nectar feeding.
Function of vitamin A in vertebrate embryonic development. Zile, Maija H. Journal of Nutrition, Mar. 2001, v. 131 (3), p. 705-708. ISSN: 0022-3166.
NAL call no: 389.8 J82
Descriptors: congenital abnormalities, nutritional disease, vitamin A deficiency, bird embryo.
Abstract: Advances in molecular biology and retinoic acid receptor research have significantly contributed to the understanding of the role of vitamin A during vertebrate development. Examination of the function of this vitamin during very early developmental stages using the completely vitamin A-depleted avian embryo has revealed that the vitamin A requirement begins at the time of formation of the primitive heart, circulation and specification of hindbrain. The lack of vitamin A at this critical time results in gross abnormalities and early embryonic death. In rodent models, vitamin A deficiency can be targeted to later gestational windows and documents the need for vitamin A for more advanced stages of development. Major target tissues of vitamin A deficiency include the heart, central nervous system and structures derived from it, the circulatory, urogenital and respiratory systems, and the development of skull, skeleton and limbs. These abnormalities are also evident in mice mutants from retinoid receptor knockouts; they have revealed both morphological and molecular aspects of vitamin A function during development. Retinoic acid receptors (RAR) in partnership with retinoid X receptor (RXR)alpha appear to be the important retinoid receptor transcription factors regulating vitamin A function at the gene level during development via the physiologic ligand all-trans-retinoic acid. Homeostasis of retinoic acid is maintained by developmentally regulated vitamin A metabolism enzyme systems. Inadequate vitamin A nutrition during early pregnancy may account for some pediatric congenital abnormalities.
How does time since feeding affect the fuels pigeons use during flight? Gannes, L.Z.; Hatch, K.A.; Pinshow, B. Physiological and Biochemical Zoology, 2001, v. 74 (1), p. 1-10. ref. ISSN: 1522-2152.
NAL call no: QL1.P52
Descriptors: blood plasma, carbohydrates, catabolism, feeding, flight, oxidation.
Abstract: Time between meals can vary from multiple hours to days within and among species. We investigated the effects of time since feeding on lipid, protein, and carbohydrate oxidation in flying pigeons (Columba livia) by interpreting changes in blood plasma metabolite concentrations and mass during flight. Five pigeons on the Ben-Gurion University, Negrev, Israel flown or rested for 4 h after feed deprivations of 2, 12, 24 and 48 h. After flight, blood plasma concentrations of uric acid and beta-hydroxybutyrate were elevated over control and preflight values, indicating elevated protein and lipid catabolism during flight. Lipid oxidation, as indicated by changes in beta-hydroxybutyrate concentration, increased more than in unfed flying pigeons compared with recently fed flying pigeons and with resting controls. Protein oxidation, as indicated by changes in uric acid concentrations, also positively covaried with feeding time; the covariation was mostly caused by increases in 48 h food-deprived pigeons. Unfed birds lost less mass during a 4 h flight than recently fed birds. We reasoned that recently fed pigeons oxidized more glycogen in flight than pigeons not recently fed; calculated glycogen stores explained 72%-117% of mass loss differences between 2 and 48 h fed pigeons. Thus, time since feeding was an important determinant of the fuels pigeons used in flight.
Huidige vooruitgang in volstruisvoeding. [Current trends in ostrich feeding.] Brand, T.; Brand, Z.; Nel, K.; Van Schalkwyk, K.; Van der Merwe, G.; Young, D.; Van der Walt, J. Elsenburg Journal, 2001, p. 9-13. ref. ISSN: 0250-1538. Full text available: www.elsenburg.com. Note: In Africans with an English summary.
Descriptors: ostriches, animal feeding, nutritional requirements, energy value.
Long-term fasting and re-feeding in penguins. Groscolas, Rene; Robin, Jean Patrice. Comparative Biochemistry and Physiology Part A Molecular and Integrative Physiology, Mar. 2001, v. 128A (3), p. 645-655. ISSN: 1095-6433.
NAL call no: QP1.C6
Descriptors: starvation, long-term fasting, review of adaptations, lipids, protein catabolism, feeding physiology.
Abstract: Spontaneous fasting during reproduction (sometimes with a full stomach) and moult is a major characteristic of the annual cycle of penguins: Long-term fasting (up to four months in male emperor penguins) is anticipated by the accumulation of fat (incubation fast) and of fat and protein (moult fast). During most of the incubation fast, birds rely almost entirely on lipids as an energy source, body proteins being spared. However, below a critical (but non-total) fat store depletion, marked behavioral, metabolic, and endocrine changes occur. Spontaneous locomotor activity increases and the egg is transitorily left unincubated for increasingly long periods, until it s definitive abandon and the bird departs to re-feed at sea. These changes are thought to be activated by an endogenous re-feeding signal triggered before lethal energy depression. An increase in body protein catabolism in the face of a reduction in lipid availability and utilisation, and an increase in circulating corticosterone vs. a decrease in plasma prolactin, are likely to be major metabolic and humoral components of this signal. The survival and rapid restoration of energy stores in birds having departed to re-feed at a stage of near total lipid depletion demonstrates the effectiveness of the re-feeding signal. Penguins, and possibly other seabirds, are therefore appropriate animal models for understanding the long-term interactions between body energy reserves and fasting, breeding and feeding physiology and behavior.
The maintenance nitrogen requirement of the zebra finch Taeniopygia guttata. Allen, L.R.; Hume, I.D. Physiological and Biochemical Zoology, 2001, v. 74 (3), p. 366-375. ref. ISSN: 1522-2152.
NAL call no: QL1.P52
Descriptors: dietary minerals, nitrogen, seed diets, protein levels, procedures.
Abstract: A procedure is described for the accurate determination of the maintenance nitrogen requirement (MNR) of small granivorous birds. When used with zebra finch (Taeniopygia guttata), it yielded a MNR of 403 mg kgW-0.75 d-1. This is lower than most other passerines so far measured and more similar to some nonpasserine species. Similarly, the value for endogenous nitrogen loss estimated for the zebra finch (153 mg kgW-0.75 d-1) is less than that for passerines in general but higher than the nonpasserine value. We suggest that the low MNR of the strictly granivorous zebra finch is primarily an adaptation to seed diets in which high-quality protein is a limiting factor. Comparison with a wider range of species reported in the literature was restricted because inappropriate methods have been used to estimate MNR in many cases, including the use of growing or reproducing birds and the assumption that maintenance of the body mass necessarily coincides with maintenance of zero nitrogen balance.
Nutrition of birds in the order Psittaciformes: A review. Koutsos, E.A.; Matson, K.D.; Klasing, K.C. Journal of Avian Medicine and Surgery, 2001, v. 15 (4), p. 257-275. ref. ISSN: 1082-6742.
NAL call no: SF 994.J6
Descriptors: animal nutrition, diets, feeding behavior, nutrient requirements, parrot type birds, malnutrition in captive birds.
Abstract: Over 350 species of birds make up the order Psittaciformes; many of these are maintained in captive environments. Malnutrition is commonly diagnosed in captive psittacine birds; therefore, providing nutritionally adequate diets must be a primary concern. This review integrates quantitative information on the dietary habits and nutritional requirements of psittacine birds to facilitate the formulation and evaluation of diets for birds in captivity. Initially, characterization of the diet and feeding strategy of a particular species in the wild can provide insight into appropriate diet choices in captivity. Knowledge of the gastrointestinal anatomy and physiology can be used to elucidate the capacity of that species to utilize various feedstuffs. Foe example, the presence of a highly muscular gizzard may allow a bird to utilize a seed-based diet, whereas a species possessing a small gizzard may be unable to process such a diet. Finally, nutrient requirements determined in a particular species or a related species (e.g. similar digestive physiology and feeding strategy) may be applied to create a nutritionally adequate diet. Understanding the factors involved in selecting appropriate diets enables aviculturists, veterinarian, and nutritionists to maintain and propagate these birds with increased success.
Order Psittaciformes (parrots, macaws, conures). Nutrition. Carciofi, Aulus Cavalien. Biology, Medicine and Surgery of South American Wild Animals, 2001. i-x. 1-536. Chapter pagination: 152-157. Fowler, Murray E.; Cubas, Zalmir S. (eds). Iowa State University Press, Ames, IA. ISBN: 0813820465.
NAL call no: SF996.4.B56 2001
Descriptors: care in captivity, nutrition, diet, dietary requirements, diseases.
Overview of nutraceutical and herbal therapies for birds. McCluggage, D. Exotic DVM, 2001, v. 3 (6), p. 8-11. ISSN: 1521-1363.
NAL call no: SF981.E96
Descriptors: chaparral, herbal drugs, potency, ubiquinones.
Pet bird feeding strategies-facts and fallacies. Brue, R.N. Proceedings North American Veterinary Conference, Gainesville, FL. Eastern States Veterinary Association, Jan. 13-17, 2001, Orlando, FL.
NAL call no: SF605.N672
Descriptors: birds, animal feeding, animal nutrition.
Seed preferences by birds: Effects of the design of feeding-preference experiments. Cueto, Victor R.; Marone, Luis; de Casenave, Javier Lopez. Journal of Avian Biology, Sept. 2001, v. 32 (3), p. 275-278. ISSN: 0908-8857.
Descriptors: feeding analysis techniques, food preference determination, food plants, Rufous-collared Sparrows, Zonotrichia capensis, 8 seed options.
Abstract: We analysed the effects of the design of feeding-preference experiments in a study of seed selection by Rufous-collared Sparrows, Zonotrichia capensis. We presented eight seed options in multiple- and simple-offer experiments. Statistical results indicated that in multiple-offer tests there were three preferred, and two avoided seed species. The other three species could not be assigned to any of those groups. In contrast, results of simple-offer tests showed that all seed species were preferred, except the two avoided ones. Using a graphical combination of the results of both approaches, we obtained an easily interpretable assessment of the seed preferences of Rufous-collard sparrows. In the graph space, seed species make up three groups: preferred, avoided, and less-preferred (i.e. heavily consumed in simple-offer trials, but avoided of consumed to a lesser extent in multiple-offer trials). With the combination of both protocols we avoided the biases caused by using one experimental design alone and could detect secondary-preferred food items. This seems crucial when the bird under study is plastic in its feeding preferences.
Supplemental ascorbic acid and heat stress in growing Japanese quail chicks. Abou-Egla, E.H. Mansoura University Journal of Agricultural Sciences, May 2001, v. 26 (5), p. 2653-2665. ISSN: 1110-0346.
Descriptors: quails, feed additives, ascorbic acid, nutritive value, temperature resistance.
2000
Desempenho produtivo da
perdiz (Rhynchotus rufescens) submetida a racoes com diferentes niveis energeticos.
[Productive performance of partridge (Rhynchotus refescens) fed diets
containing different energy levels.] Moro, M.E.G.; Tavates, F.A.; Lima,
C.G. Revista Brasileira de Ciencia Avicola, 2000, v. 2 (1), p. 13-18.
ref. Note: In Portuguese.
Descriptors: energy consumption, energy requirements, feeding, diets, feed intake, feed conversion efficiency, egg production, liveweight gain.
Abstract: The optimum energy levels in rations for partridges during their reproductive phase were investigated by evaluating feed intake, liveweight gain, feed conversion efficiency and average egg production. 24 R. rufescens, 10 months old, were fed on 3 isoproteic rations (15% CP) with different levels of ME (2650, 2800 and 2950 kcal ME/kg). A completely randomized experimental design with three treatments and four replicates per experimental unit was used. There was no significant differences in feed intake, but energy level had a significant effect on mean egg weight, egg production and feed conversion efficiency for the 2650 and 2800 kcal ME/kg diets compared with the 2950 kcal ME/kg diet. It is concluded that energy levels from 2650 to 2800 kcal ME/kg be used in partridge diets during the reproductive phase.
The diet and nutrition of the Namaqua sandgrouse, an arid-zone granivore. Lloyd, P.; Durrans, L.; Gous, R.; Little, R.M.; Crowe, T.M. Journal of Arid Environments, 2000, v. 44 (1), p. 105-122. ref. ISSN: 0140-1963.
NAL call no: QH541.5.D4J6
Descriptors: feeding behaviour, seeds, nutritive value, composition, wild birds, Pterocles namaqua.
Abstract: A study was conducted to evaluate the feeding behaviour of the Namaqua sandgrouse, Pterocles namaqua, and the nutritive value of its principal seed diets.
Dietary nitrogen as a limiting nutrient in frugivorous birds. Bosque, Carlos; Pacheco, M. Andreina. Revista Chilena de Hostoria Natural, Sept. 2000, v. 73 (3), p. 441-450. ISSN: 0716-078X.
Descriptors: nutrition, dietary nitrogen, fruit eaters, energy needs, nutritional requirements, physiology.
Abstract: Fruit pulp is considered nutritionally inadequate for frugivorous birds because of its low protein content. Consequently, frugivores are expected to minimize their nitrogen losses as an adaptation to frigivory. In this review we examine properties of fruit and physiological traits of frugivores that affect their ability to subsist on fruit diets. Most tropical and temperate fruit seem to contain enough nitrogen to satisfy the birds if their food intake was adjusted to meet their energy needs, but requirements depend on body mass. Birds of larger body size should require foods having a higher ratio of nitrogen to energy than smaller species. However, digestible nitrogen may in fact be limiting because fruit pulp seems to contain considerable amounts of nonproteinaceous nitrogen and an amino acid composition that deviates from that required by birds. Both of these characteristics of fruit pulps should augment nitrogen losses of frugivores and consequently their needs when consuming natural diets. In terms of their physiology, we expect frugivores to maximize their nitrogen extraction efficiency from the diet and hint the possibility that low urinary nitrogen losses of frugivores might be related to a low metabolic rate. Minimization of endogenous fecal losses could be the most important adaptation of frugivores to subsist on nitrogen poor diets. It is not evident how specialized frugivores can have lower than expected nitrogen requirements when compared to birds of other dietary groups. We suggest several areas of research that should improve out understanding of the complex interactions involved in the regulation of protein needs of frugivorous birds.
Effects of diet with different levels of protein and energy content on reproductive traits of utility-type pigeons kept in cages. Meleg, I.; Dublecz, K.; Vincze, L.; Horn, P. Archiv fuer Gefluegelkunde, 2000, v. 64 (5), p. 211-213. ISSN: 0003-9098.
NAL call no: 47.8 AR2
Descriptors: pigeons, animal feeding, energy, feed intake, conversion efficiency.
Utjecaj drzanja i prehrane tijekom ljetnih mjeseci na bolesti kucnih ptica. [Effects of housing and nutrition during summer months on disease incidence in pet birds.] Hraste, A; Tratnjak, D. Veterinarska Stanica, 2000, v. 31 (4), p. 209-210. ref. ISSN: 0350-7149. Note: In Croation.
Descriptors: animal housing, summer, nutrition, heat stress, intestinal diseases.
Energetics and nutritional ecology of small herbivorous birds. Lopez-Calleja, M. Victoria; Bozinovic, Francisco. Revista Chilena de Historia Natural, Sept. 2000, v. 73 (3), p. 411-420. ISSN: 0716-078X.
Descriptors: behavior, digestive system, energy requirements, nutritional requirements, Phytotoma rara, adaptations to plant-based diet.
Abstract: Herbivory is a rare strategy in birds. Only 3% of extant birds exploit plant material as an energy source. Both plant chemical composition and bird constraints associated to flight and digestion may explain why herbivory is so scarce in small endotherms such as birds. Here we tackle the question on how herbivorous birds meet energy/nutrient requirements when feeding on extremely poor diets. We focus on Phytotoma rara (Phytomidae), possibly the smallest herbivorous bird. From our mini-review we conclude that several features such as the fast passage rates, and effective physical breakdown of cell walls, and constant and high activities of digestive enzymes make available the highly nutritious cell contents to the small herbivore, without the energy costs of anatomical structures for bacterial fermentation or slow passage rates. These are possible crucial adaptations in the evolution of hebivory in small birds.
Estimating the energy needs of pet birds. Harper, E.J. Journal of Avian Medicine and Surgery, 2000, v. 14 (2), p. 95-102. ref.
NAL call no: SF994.J6
Descriptors: diets, energy content, energy consumption, energy requirements, expenditures, mathematical equations, energy.
Abstract: A review. Little is known about the energy requirements of pet birds. Because animals generally eat to meet energy requirements, the nutrient content of a diet must be balanced with energy content. To formulate balanced diets for a range of bird species, both the energy needs of the relevant bird species and the energy content of the diet must be calculated. The most practical way of understanding the energy requirements of pet birds is by studying their daily energy expenditure. Factors affecting energy requirements are body size, activity patterns, environmental temperature, plumage cover, age, and physiological state. Energy costs of maintenance are directly related to the lean body mass and the relative size of different organs, because these are the tissues that actively use oxygen. Activity patterns also have a considerable impact; the difference between sitting and standing can affect the daily energy expenditure by as much as 42%. There are a variety of published allometric equations for determining avian energy requirements, but those derived from fasted species are inappropriate. For companion birds, equations derived for the particular body-weight range of the avian species in question are the most applicable. Two equations are recommended: one for calculating the energy requirements of avian species less than 100 g, and the second for avian species whose body weights are in the range of 100-1500 g.
[The feeding activity of Derby’s parakeet (Psittacula derbiana) in captivity.] Yang, XiaoJun; Wen, XianJi; Wang, ShuZhen; Yang, Lan; Yang, HongJun; Dong, RongMei; Zhang, YuKun; Dong, Xin; Li, YuanChun; Yang, X.J.; Wen, X.J.; Wang, S.Z.; Yang, L.; Yang, H.J.; Dong, R.M.; Zhang, Y.K.; Dong, X.; Li, Y.C. Zoological Research, 2000, v. 21 (2), p. 115-120. ref. ISSN: 0254-5853. Note: In Chinese.
NAL call no: QL1.J874
Descriptors: feeding, behaviour, feeding frequency, total feeding time, regression equation, sex differences, seasonal variation.
Abstract: The feeding activity of 20 captive Derby’s parakeets in 4 groups was observed by instantaneous method and scan sampling method from March 1994 to February 1995. 254 completed feeding activities were observed by all-occurrences’ recording method from March 1996 to September 1998. The daily feeding frequency of Derby’s parakeets were 32.12+14.28, and the daily time spent on feeding was 153.23+73.11 min, which accounted for 14.51% of total observing time. The feeding frequency and feeding time in different individuals were different (frequency F=1.747, time F=1.791; P<0.05). The daily feeding frequency and total feeding time were correlated. The daily feeding activity had two main peaks. Generally the first appeared from 7.00 to 10.00 h, the second was from 15.00 to 19.00 h. However, the time when the peak occurred was different in different seasons. The feeding activities began earlier and stopped later in summer and vice versa in winter. The daily feeding frequency of young was not significantly different from that of adult, but the duration of each feeding activity lasted longer in young than in adult., e.g. young spent longer time for feeding than adult daily. The daily time spent on feeding by male and female was not significantly different from that by female, while the feeding frequency of female was less than that of male, and the duration of each activity lasted longer in female than in male. The results by using all-occurrences’ recording method showed that: The feeding activity consisted of a series of behaviours, including picking-up with bill, grabbing with foot, chewing, carrying food (in bill or foot), body caring, looking, threatening, and courtship feeding. The picking-up with bill, grabbing with foot and chewing were >90%. The feeding activity began with picking-up (100%), then chewing (95.56%), carrying food (2.87%) or threatening (0.57%; and then picking-up (85.06%), carrying food (7.47%), chewing (1.15%), body caring (1.15%), grabbing with foot (3.45%), courtship feeding (0.57%) or looking (1.15%), and etc. The stepwise regression showed that the feeding activity of males and females were affected by all behaviours. Temperature, relative humidity and illumination were not the factors significantly affecting the feeding activities. The feeding activities of young birds were affected by resting, fed by parents, bite, locomotion and temperature. The regression equation is as follows: Y=1578.74-1.95 X3-1.76 X4-0.85 X5-1.44 X6-0.74 X7 Y stood for daily feeding time, X3, X4, X5, X6 and X7 respectively stood for temperature, resting, locomotion, feeding by parents and bite.
Healthy Bird ® Avian Nutrition System. Rohrberg, Roderick G.; Lillie, Thomas C. Official Gazette of the United States Patent and Trade Mark Office, Patents, (e-file), Aug. 22, 2000; 1237 (4): No pagination. ISSN: 0098-1133.
NAL call no: T223.A21
Descriptors: animal care, foods, nutrition, avian nutrition system.
Abstract: Methods and liquified dietary supplements for enhancing and maintaining the health of birds are disclosed. The invention also includes dietary supplements which are intended to promote avian well-being by providing a daily regimen of two specifically designed formulas. The Healthy Bird® Sunrise Formula is a morning supplement which furnishes quick energy, and maintains the natural acid base balance of the bird. The Healthy Bird® Sunset Formula is an evening supplement which enables the bird to begin its rest cycle. Both preparations are novel compositions which furnish highly nutritional dietary regimens for domesticated birds.
Huidige vooruitgang in volstruisvoeding. [Effects of feed particle size on the digestive process in domestic birds.] Carre, B. Special Issue. Feed Particle Size and Animal Nutrition. Production Animals. 2000, v. 13 (2), p. 131-136. ref. ISSN: 0990-0632. Note: In French.
Descriptors: feeds, digestion, feed particle size, effects, transit time in the gut, digestibility, retention.
Abstract: The effects of feed particle size on the digestive process in domestic birds are reviewed. This paper is divided into two parts: the effects on digestive transit times and the availability of intracellular plant components. Coarse particles compared to fine ones generally result in an increase in total transit time due to a longer retention time in the gizzard. According to the literature, it seems that coarse grinding should be positive for reducing water losses, and also, in some cases, for protein digestibility. The latter effects would be explained by better control of the intestine transit time by the gizzard emptying when using coarse ground feeds. Coarse grinding may result in low availabilities for some of the intracellular components of dicotyledon whole seeds as observed for soyabeans, rapeseeds, fava beans and peas. In contrast, cereals seem to be much less sensitive to particle size variations. In dicotyledon seeds, the intracellular components do not show the same sensitivity: the highest sensitivities to particle size variations are generally observed for lipids and starch. However, if a pelleting process is applied after grinding, the effects of the grinding intensity are considerably reduced with, in this case, similar digestibility values close to a maximum.
Iron storage diseases in birds. Cork, S.C. Avian Pathology, 2000, v. 29 (1), p. 7-12. ref. ISSN: 0307-9457.
NAL call no: SF995.A1A9
Descriptors: storage, absorbable iron, liver, hemosiderosis, reviews, metabolic disorders, Kupffer cells, iron uptake, Peris iron stain.
Abstract: Parenteral iron is toxic to many species but, because the uptake of iron from the diet is regulated in the intestine, acute intoxication is not seen under natural conditions. Chronic ingestion of large amounts of absorbable iron in the diet can lead to the storage of iron in the liver in many species, including man. The excess iron is stored within hepatocytes as haemosiderin and can be quantitatively assessed by liver biopsy or at necropsy using special stains such as Peris iron stain and/or biochemical tests. Iron may also be found within the Kupffer cells in the liver and the macrophage cells of the spleen especially where concurrent diseases are present such as haemolytic anemia, septicemia, neoplasia and starvation. Iron accumulation in the liver, also known as haemosiderosis, may not always be associated with clinical disease although in severe cases hepatic damage may occur. It is probable that concurrent disease conditions are largely responsible for the degree and nature of the pathological changes described in most cases of haemosiderosis. In some humans there may be a genetic predisposition to iron storage disease, haemochromatosis, associated with poor regulation of iron uptake across the intestine. In severe cases iron pigment will be found in the liver, spleen, gut wall, kidney and heart with subsequent development of ascites, heart failure and multisystem pathology. Clinical disease associated with accumulation of iron in the liver, and other tissues, has been reported in many species of bird although it is most commonly reported in Indian hill mynas (Gracula religiosa) and toucans (Ramphastos sp.). It is likely that the tolerance to the build up of tissue iron varies in individual species of bird and that the predominant predisposing factors may differ, even within closely related taxonomic groups.
Nitrogen requirements of an Old World nectarivore, the orange-tufted sunbird Nectarinia osea. Roxburgh, L.; Pinshow, B. Physiological and Biochemical Zoology, 2000, v. 73 (5), p. 638-645. ref.
NAL call no: QL1.P52
Descriptors: nitrogen requirements, urine, body weight, nitrogen balance, captive-bird study.
Abstract: Nectivorous birds are represented by three major radiations: honeyeaters and sunbirds in the Old World and hummingbirds in the New World. Costa’s hummingbirds and New Holland honeyeaters have unusually low nitrogen requirements, which have been related to the species’ low-protein, high-sugar diets. Therefore, we hypothesised that orange-tufted sunbirds (N. osea) would likewise have low-maintenance nitrogen requirements and low rates of endogenous nitrogen loss. To test this hypothesis, we measured nitrogen balance, total endogenous nitrogen loss, and body mass changes in captive birds using insects as a nitrogen source. Nitrogen balance, estimated by regression analysis to be 3.9 mg d-1, was less than one-half of that allometrically predicted, while total endogenous nitrogen loss (1.9+0.6 mg d-1) was less than one-third of the allometrically predicted value. Thus, orange-tufted sunbirds follow the same pattern of low nitrogen requirements found in hummingbirds and honeyeaters. Total endogenous losses of nitrogen in nectivores are low because a fibreless, easily digestible liquid diet reduces nitrogen losses in the feces, while the protein-sparing effect of a diet containing largely sugar leads to endogenous urinary nitrogen losses.
The nutritional, morphologic, and physiologic bases of nectarivory on Australian birds. Gartrell, B.D. Journal of Avian Medicine and Surgery, 2000, v. 14 (2), p. 85-94. ref.
NAL call no: SF994.J6
Descriptors: foods, forage, nutrient requirements, protein requirements, nectar, honey eaters, swift parrots, Lathamus discolor, lorikeets, adaptive physiology.
Abstract: A review. Nectarivorous birds are those that rely predominantly on the products of flowering trees and shrubs for food. Australian avian nectarivores include honey-eaters of the family Meliphagidae and lorikeets and swift parrots (Lathamus discolor) of the family Psittacidae. Nectar is a sugar-rich, liquid food source that provides abundant amounts of energy for birds that are able to harvest it. However, it contains very low levels of amino acids, vitamins, and trace minerals necessary for avian maintenance, growth, and reproduction. Therefore, birds classified as nectarivores need to forage for other food resources. Manna, honeydew, and lerp are common food sources for a variety of honey-eaters and nectarivorous parrots; these foods are high in carbohydrates and low in protein, similar to nectar. Pollen protoplasm is composed of highly digestible protein and contains a diverse amino acid profile; however, only 3 Australian species of psittacine birds have been recorded engaging in active pollen harvesting. Insects are thought to be the main source of protein for nectarivores. Nectarivorous birds have developed a variety of morphological and physiological adaptations. Morphological adaptations to nectarivory include changes in body size, plumage, beak and tongue structure, and the alimentary organs. The physiology of nectarivory is still poorly understood, but there are indications that adaptations may include lowered metabolic rates, lowered protein requirements, and changes in digestive and renal physiology. Considerable work is needed to illuminate the specific nutritional requirements of nectarivores for maintenance, growth, and reproduction.
The science of tastefully formulating bird food. Matson, Kevin D. Exotic Bird Report, Jul. 2000, v. 12 (1), p. 1-3.
Descriptors: diet in captivity, taste, perception, response, thresholds, diet formulation.
Taste threshold determination and side-preference in captive cockatiels (Nymphicus hollandicus). Matson, K.D.; Milliam, J.R.; Klasing, K.C. Applied Animal Behaviour Science, 2000, v. 69 (4), p. 313-326. ref. ISSN: 0168-1591.
NAL call no: QL750.A6
Descriptors: consumption, flavor, NaCl, sucrose, feeding behavior, citric acid, taste preferences, water, captive birds.
Abstract: The taste threshold of caged cockatiels (Nymphicus hollandicus) for aqueous solutions of sodium chloride, citric acid, and sucrose were studied using two-choice taste-preference tests. The effects of location on the threshold were tested by putting the flavoured solution in either the preferred or non-preferred locations (i.e. sides of cages) and offering water in the opposite location. Four parameters (total consumption, consumption from preferred side, consumption from non-preferred side, and proportion of test solution consumed) were measured at the end of 3-day test periods. Experiments were repeated with increasing concentrations of test flavours until intake variables were significantly (p<0.05) affected. The results showed that birds distinguished (p<0.05) between purified water and 0.16 mol 1-1 sodium chloride and citric acid, 0.36 mol 1-1 sucrose, or pH 5.5 citric acid. The likelihood of detecting a taste threshold was greater for sodium chloride and citric acid when these solutions were placed on the preferred side. In contrast, sucrose sensitivity was greater when this solution was offered on the non-preferred side.
The true metabolisable energy content of canola oilcake meal and full-fat canola seed for ostriches (Struthio camelus). Brand, T.S.; De Brabander, L.; Van Schalkwyk, S.J.; Pfister, B.; Hays, J.P. British Poultry Science, May 2000, v. 41 (2), p. 201-203. ISSN: 0007-1668.
NAL call no: 47.8 B77
Descriptors: animal husbandry, nutrition, ostrich, metabolisable energy, protein and energy sources.
Abstract: 1. The true metabolisable energy (TME) of canola oilcake and oil-fat canola seed was determined for ostriches to broaden our knowledge of canola as a potential protein and energy source for ostriches. 2. Both test materials were diluted with a basal diet, fed to ostriches and TME-values estimated by multiple regression analysis. 3. The TME values for canola oilcake meal and full-fat canola seed for ostriches were respectively 13.76 MJ kg-1 and 22.5 MJ kg-1. 4. The TME values obtained for these 2 important protein sources will assist on the more accurate formulation of diets for ostriches.
Why do nutrient requirements differ among bird species? Koutsos, Elizabeth A.; Klasing, Kirk C. Exotic Bird Report, July 2000, v. 12 (1), p. 4-6, 8.
Descriptors: dietary requirements, nutrition, diet, energy requirements, species differences.
Zywienie strusi i emu - podstawy fizjologiczne i zapotrzebowanie na skladniki pokarmowe. [Feeding ostriches and emus: Physiological basis and nutritional requirements: a review.] Jamroz, Dorota. Prace i Materialy Zootechniczne, 2000. v. 56, p. 51-73. ISSN: 0137-1649. Note: In Polish.
NAL call no: SF1.P672
Descriptors: animal husbandry, nutrition, energy requirements, ostrich, emu.
Abstract: This paper is a review of literature in the field of nutrition of ostriches and emus - the biggest herbivorous birds in the world. The keeping and breeding of these birds develops dynamically not only in south Africa, Australia, Israel, Canada and United States, but also in many European countries, including Poland. Essential information is presented relative to the specificity of the digestive tract, digestibility and requirements for nutrients and energy depending on the age and performance of birds. Also, principles are described of the practical feeding of ostriches and emus as well as the basal characteristics of ostrich egg and meat composition. Cited are 34 references.
1999
Basic concepts and recent advances in digestion and nutrition. Cilliers, S.C.; Angel, C.R.; Deeming, D.C. The Ostrich: Biology, Production and Health, 1999, p. 105-128. ref. ISBN: 0851993508.
NAL call no: SF511.O774 1999
Descriptors: digestion, age, diet, feeds, amino acid metabolism, wild ostriches, feed-flow programs.
Abstract: This chapter briefly describes reports of the diet of wild ostriches. The anatomy of the digestive tract and changes induced by age and diet are also discussed. Other sections include: feedstuff evaluation; amino acid metabolism; implications of urea contamination of ostrich diets; and practical feed-flow programmes.
Calculating the required volume of avian nutritional products. Bartges, J.; Ritchie, B.W. Compendium on Continuing Education for the Practicing Veterinarian, 1999, v. 21 (8), p. 694-695. ref. ISSN: 0193-1903.
NAL call no: SF601.C66
Descriptors: nutrient requirements, therapeutic diets, trauma, nutrients, surgery.
Abstract: Nutritional support is important in the management of avian patients that are ill or recovering from trauma or surgical procedures. Provision of adequate calories is essential during convalescence. Formulae for calculating caloric requirements for avian patients are presented and discussed.
Comparison of metabolite energy values of different foodstuffs determined in ostriches and poultry. Cillers, S.C.; Sales, J.; Hayes, J.P.; Chwalibog, A.; Du Preez, J.J. British Poultry Science, Sept. 1999, v. 40 (4), p. 491-494. ISSN: 0007-1668.
NAL call no: 47.8 B77
Descriptors: animal husbandry, nutrition, ostriches, energy, values of foodstuff.
Abstract: 1. Apparent (AMEn) and true (TMEn) metabolisable energy values, corrected for nitrogen retention of wheat bran, saltbush (Atriplex nummularia), common reed (Phragmites australis), lupins, soyabean oil cake meal (SBOCM), sunflower oil cake meal (SFOCM) and fishmeal were compared in 7 successive trials using 12 mature South African Black ostriches and 10 adult Australorp cockerels per ingredient. 2. TMEn values of 11.91, 7.09, 8.67, 14.61. 13.44, 10.79 and 15.13 MJ/kg for wheat bran, saltbrush, common reed, lupins, SBOCM, SFOCM and fishmeal, respectively, were found for ostriches in comparison to lower (P<0.05) values of 8.55, 4.50, 2.79, 9.40, 9.04, 8.89 and 13.95 MJ/kg for cockerels. 3. The higher (P<0.05) ME values for ostriches confirm that the ostrich is capable of digesting foodstuffs, especially those with high fibre concentrations such as drought-resistant fodders, more effectively than poultry. Plant protein sources could make a considerable energy contribution to diets for ostriches. 4. It is concluded that it is essential to use energy values of foodstuffs determined using ostriches and not extrapolated values derived from poultry in diet formulation for ostriches.
[Digestive system of the ostrich.] Li, XuGang; Zhu, HongQiang: Sun, ZeWei (et al); Li, X.G.; Zhu, H.Q.; Sun, Z.W. Journal of Economic Animal, 1999, v. 3 (3), p. 43-45. ref. Note: In Chinese.
Descriptors: digestive system, ostrich, structure, functions.
Does shifting from a commercial to a natural diet affect the nutritional status of hand-reared grey partridges Perdix perdix? Liukkonen, Anttila T.; Putaala, A.; Hissa, R. Wildlife Biology, 1999, v. 5 (3), p. 147-156. ref.
NAL call no: SK351.W663
Descriptors: composition, energy content, energy intake, nutrients, blood chemistry, hand-reared, animals, 6 weeks to adapt.
Abstracts: Two feeding trials (January to April 1996 and 1997) using a total of 54 hand-reared grey partridges were performed in Finland to study the effect of a change from a commercial pelleted diet to a natural diet (barley, oats and weed seeds) on body mass, food consumption, metabolised energy coefficient, gut morphology and some blood metabolites. The abrupt change in the diet which takes place when hand-reared birds are released into the wild was simulated. Controls continued to be given the pelleted diet throughout the trial. Group body mass decreased significantly after the change in diet. However, within 1 week, body mass started to increase again, but it stabilised at a lower level than in control birds (P<0.05). Compared with controls, birds in the test group consumed more food (fresh weight) during the feeding trial (P<0.001) and produced more excreta during the 2nd, 4th and 5th week of the feeding trial (P<0.001). Gross energy intake, amount of metabolised energy and metabolised energy coefficient decreased and excretory energy content increased during the feeding trial. No differences were seen in the analysed blood metabolites. Gizzards of the test birds were heavier than those of the control birds (P=0.01). It is concluded that a period of 6 weeks may be inadequate for partridges to get totally adapted to a new diet.
Ecological constraints on digestive physiology in carnivorous and piscivorous birds. Hilton, G.M.; Houston, D.C.; Barton, N.W.H.; Furness, R.W.; Ruxton, G.D. Special Issue: Avian Gastrointestinsl and Renal Function. Journal of Experimental Zoology, 1999, v.283 (4-5), p. 365-376. ref. ISSN: 0022-104X.
NAL call no: 410 J825
Descriptors: digestive tract, digestion, reviews, feeding behaviour, physiology, meat and fish eating birds, absorption efficiencies, gut length.
Abstract: Digestive strategies of meat-and fish eating birds have received little attention, and the assumption has generally been made that there is rather little variation in digestion parameters between species in these guilds. That there is a significant though small variation between species in apparent absorption efficiency is demonstrated here. This variation is associated with an apparent trade-off between retention time of digesta and apparent absorption efficiency: short retention times result in low apparent absorption efficiency. It is shown that, in raptors, rapid digestion is a consequence of both reduced gut length and increased flow rate of digesta. The ecological correlates of digestive strategy in raptors and seabirds are demonstrated. Rapid digestion appears to be associated with a pursuit foraging mode, whereas slow digestion tends to occur in species with a searching foraging mode. It is suggested that in raptors which actively pursue aerial prey, the weight savings that can be achieved through rapid but inefficient digestion exceed the costs in reduced apparent absorption efficiency. However, a species which adopts a strategy of rapid but inefficient digestion may be restricted in diet to high-quality food types, whereas species with a slow but efficient digestive strategy are able to exploit a wide range of food types, including low-quality prey.
Energetics of hummingbird foraging at low ambient temperature. Gass, C.L.; Romich, M.T.; Suarez, R.K. Canadian Journal of Zoology, 1999, v. 77 (2), p. 314-320. ref. ISSN: 0008-4301.
NAL call no: 470 C16D
Descriptors: energy balance, energy consumption, energy intake, thermoregulation, Rufous hummingbirds, Selasphorus rufus, sucrose solutions, metabolic rates.
Abstract: Because of their small size and high energetic costs of hovering and forward flight, hummingbirds achieve the highest mass-specific metabolic rates known among vertebrates. Rufous hummingbirds (Selasphorus rufus) stop to refuel on floral nectar in subalpine meadows as they migrate south from British Columbia, Canada, to Mexico. In such habitats they face the challenge of achieving daily net energy gain despite the high energy costs of flight and thermoregulation at near-freezing morning temperatures. Hummingbirds provided with 15 or 20% sucrose while subjected to these conditions for 4 h in the laboratory did not remain in energy balance and loss mass. However, they achieved energy balance or net energy gain on 30% sucrose. Because these sucrose concentrations are within the range observed in the nectar of hummingbird-visited flowers, the results suggests that the energetic cost of thermoregulation may influence the coevolution of hummingbirds and flowers. Hummingbirds maintaining energy balance at low ambient temperature via high foraging frequencies and high rates of energy intake can sustain average metabolic rates of about 250 W/kg over a 4-h period. These are the highest metabolic rates known among vertebrates at which rates of dietary energy intake equal rates of energy expenditure.
Energy metabolism in an obligate frugivore, the superb fruit-dove (Ptilinopus superbus). Schleucher, E. Australian Journal of Zoology, 1999, v. 47 (2), p. 169-179. ref. ISSN: 0004-959X.
NAL call no: 410 Au73
Descriptors: wild birds, energy metabolism, metabolism, fruit eaters.
Le esigenze nutritive dei fasianidi. [Feeding of pheasants.] Mussa, P.P. Rivista di Avicoltura, 1999, v. 68, (3), p. 12-15. ref. ISSN: 0005-2213. Note: In Italian.
NAL call no: 47.8 R523
Descriptors: animal nutrition, feeding, game birds, reviews.
Fatty acid composition of the adipose tissue and yolk lipids of a bird with a marine-based diet, the emperor penguin (Aptenodytes forsteri). Speake, B.K.; Decrock, F.; Surai, P.F.; Groscolas, R. Lipids, 1999, v. 34 (3), p. 183-290. ref. ISSN: 0024-4201.
NAL call no: QP751.L5
Descriptors: egg yolk, fatty acids, composition, adipose tissue, carotenoids, luteins.
Abstract: The fatty acid composition of the total lipid of the yolk from emperor penguins (Aptenodytes forsteri) was characterized by high levels of –3 polyenoic fatty acids. However, it differed in several respects from that of the maternal adipose tissue. For example, the proportions of 14:0 (myristic acid), 16:1n-7 (palmitoleic acid), 20:1n-9 (gadoleic acid), 22:1n-9 (eurcic acid), 20:5n-3 (eicosapentaenoic acid), and 22:6n-3 (docosahexaenoic acid) were significantly greater in adipose tissue than in yolk. Thus adipose tissue lipids contained 7.60+0.3% and 8.0+0.3% (wt% of total fatty acids;+ meanSE; n=5) of 20:5n-3, respectively, whereas the yolk total lipid contained 1.6+0.1 and 5.5+0.3% of these respective fatty acids. The proportions of 16:0 (palmitic acid), 18:0 (stearic acid), 18:1n-9 (oleic acid), 18.2n-6 (linoleic acid), and 20:4n-6 (arachidonic acid) were significantly lower in the adipose tissue than in the yolk lipids. The proportions of triacylglycerol, phospholipid, free cholesterol, and cholesteryl ester in the yolk lipid were, respectively, 67.0+0.2, 25.4+0.3, 5.3+0.2 and 1.8+0.2% (wt% of total yolk lipid). The proportions of 20:4n-6, 20:5n-3, 22:5n-3, and 22:6n-3 were, respectively, 5.7+0.3, 2.8+0.2, 1.4+0.1, and 11.7+0.5 in phospholipid and 0.4+0.0, 1.2+0.1, 0.8+0.1 and 3.6+0.3 in triacylglycerol. About 95% of the total vitamin E in the yolk was in the form of alpha-tocopherol with gamma-tocopherol forming the remainder. Two species of carotenoids, one identified as lutein, were present.
Feed for cockatoos. Nippashi, K. Journal of Veterinary Medicine, Japan, 1999, v. 52 (4), p. 319-322. ISSN: 0447-0192.
Descriptors: aviary birds, nutrition, pets, Psittaciformes.
Feeding of ostriches. Burlini, F. Informatore Agrario, 1999, v. 55 (42), p. 111-119. ISSN: 0020-0689.
NAL call no: 281.8 IN32
Descriptors: diets, feeds, digestive system, feeding, management, nutrition, signs of malnutrition.
Abstract: Ostrich feeding is discussed. Many ostrich farmers have incorrect information about the way to feed ostriches. Causes of this are ignorance about the ostrich digestive system; and inaccurate information about some feeds. It is important to recognize a healthy chick and the effects of an unbalanced diet.
Food ingestion and water turnover in hummingbirds: How much dietary water is absorbed? McWhorter, T.J.; Rio, C.M. del; del Rio, C.M. Journal of Experimental Biology, 1999, v. 202 (20), p. 2851-1858. ref. ISSN: 0022-0949.
NAL call no: 442.8 B77
Descriptors: diets, water turnover, absorption, feeding, sugars, water, feed intake, nectar intake.
Abstract: Hummingbirds are specialized nectarivores that feed on dilute solutions of sugar with trace amounts of amino acids and electrolytes. Their diets contain excess water that, if absorbed, must be eliminated. It has been hypothesized that in hummingbirds only a small fraction of this dietary water may be absorbed in the intestine. The results of experiments designed to examine the relationship between nectar intake and water turnover in hummingbirds (Selasphorus platysercus) are reported. These results also allow the estimation of water absorption across the intestine and therefore test the hypothesis that ingested water in hummingbirds passes largely unabsorbed through the gastrointestinal tract. It was found that fractional and total water turnover increased linearly with water ingestion. At low sucrose concentration, food intake rates between four and five times body mass per 12 h were not unusual. A simple mass-balance model suggested that 78% of ingested water was absorbed in the gastrointestinal tract and hence must be processed by the kidneys. However, fractional water absorption was variable and did not appear to be correlated with food or water intake parameters. These results do not lend support to the hypothesis that the bulk of dietary water passes through the intestine unabsorbed. Although hummingbird kidneys appear well suited to excrete large volumes of dilute urine, rates of energy assimilation in hummingbirds may be constrained by excess water elimination when these birds are feeding on nectars with a low sugar concentration.
Fruit sugar preferences of house finches. Avery, M.L.; Schreiber, C.L.; Decker, D.G. Wilson Bulletin, 1999, v. 111 (1), p. 84-88. ref. USDA, APHIS, National Wildlife research Center, Gainesville, FL. ISSN: 0043-5643.
NAL call no: 413.8 W692
Descriptors: assimilation, consumption, deficiency, digestion, sugars, fructose, glucose, sucrose, hexose.
Abstract: In a series of choice tests, the relative preferences of House Finches (Carpodacus mexicanus) for equicaloric aqueous solutions of hexoses (1:1 mixture of fructose and glucose) and sucrose were determined. At 2% (m/v) birds consumed each sugar solution equally and in amounts similar to plain water. Consumption of hexose but not sucrose increased at 4% sugar concentration. At 6% and 10% finches displayed consistent, strong preferences for the hexose over sucrose. In other passerine species, strong hexose preference has been linked to the absence of sucrase, the enzyme needed for digestion of sucrose. Fecal sugar readings from the House Finches, however, indicated approximately equal assimilation of hexose and sucrose, so the hexose preference apparently is mot due to sucrose deficiency. Rather, energetics may determine the finches’ sugar preferences: hexoses are rapidly processed because the 6-carbon sugars are readily assimilable whereas sucrose must first be hydrolyzed.
Nestling diet, secondary sexual traits and fitness in the zebra finch. Birkhead, T.R.; Fletcher, F.; Pellatt, E.J. Proceedings of the Royal Society of London. Series B, Biological Sciences, 1999. V. 266 (1417), p. 385-390. ref. ISSN: 0962-8452.
NAL call no: 501 L84B
Descriptors: feeds, diets, immunity, growth, secondary sexual traits, mates, Taeniopygia guttata.
Abstract: The effect of the quality of nestling diet on the performance of adult male zebra finches (Taeniopygia guttata) in terms of their morphology, primary and secondary sexual traits, condition, immune function and survival, was investigated.
Passerine nutrition: An overview of current information. Crissey, Sue. Wildlife Rehabilitation, 1998, v. 17, p. 3-14. ISSN: 0737-1829.
NAL call no: SF996.45.J69
Descriptors: Passeriformes, diet in captivity, nutritional requirements, nutrition, perching birds.
Studies on the energy content of pigeon feeds: I. Determination of digestibility and metabolizable energy content. Hullar, I.; Meleg, I.; Fekete, S.; Romvari, R. Poultry Science, (Hungary), Dec. 1999, v. 78 (12), p. 1757-1762. ISSN: 0032-5791.
NAL call no: 47.8 AM33P
Descriptors: animal husbandry, nutrition, feed, pigeon, 10 seed species, comparison with chickens.
Studies on the energy content of pigeon feeds. II. Determination of the incorporated energy. Fekete, S.; Meleg, I.; Hullar, I.; Zoldag, L. Poultry Science, Dec. 1999, v. 78 (12), p. 1763-1767. ref. ISSN: 0032-5791.
NAL call no: 47.8 AM33P
Descriptors: pigeons, breed differences, metabolizable energy, energy content.
Using cotton seed meal in rations of growing Japanese quail. Abdel-Malak, M.S. Mansoura University Journal of Agricultural Sciences, Sept. 1999, v. 24 (9), Pt. A. P. 4527-4539. ref.
Descriptors: quails, cotton seed meal, rations, feed, digestibility, development.
Voedingsgerelateerde problemen bij gezelschapsvogels. [Diet-related problems in pet birds.] Schoemaker, N.J.; Lumeij, J.T.; Dorrestein, G.M.; Beynen, A.C. Tijdschrift voor Diergeneeskunde, Jan. 15, 1999, v. 124 (2), p. 39-43. ISSN: 0040-7453. Note: In Dutch.
NAL call no: 41.8 T431
Descriptors: goitre, nutritional diseases, metabolic diseases, endocrine disease, hypocalcemia, vitamin deficiency, parrot family, budgerigars, minahs, toucans.
Abstract: The detection and correction of dietary errors plays an important role in avian medicine. Examples of diseases caused in part by a deficiency of abundance of a nutrient include hypovitaminosis A in birds of the parrot (Psittacidae) family, hypocalcemia in the African grey parrot, goitre in budgerigars, and iron storage diseases in the minah and toucan. Hypovataminosis A can lead to metaplasia of mucous membranes, which in turn can lead to chronic rhinitis and respiratory fungal infections. Vitamin A deficiency is caused by feeding a seed based diet. Seed mixtures are often deficient in calcium, and nutritional secondary hyperparathyroidism can develop if an additional source of calcium, in the form of ground shells, is not provided. Tetanic symptoms as a result of hypocalcemia are seen only in the African grey parrot and the timneh parrot. Over supplementation with vitamin D gives rise to poisoning with polyuria and polydipsia as common initial symptoms. The exact cause of iron storage diseases in toucans and minahs is not known. A diet low in iron and vitamin C is advised as therapy. Goitre can develop in budgerigars as a result of iodine-deficient drinking water and provision of a seed mixture based on millet. An unbalanced or multideficient diet can give rise to reproductive disorders, abnormal feathers, or infections as a result of diminished resistance. It is usually not possible to relate the causes of these diseases in a simple way to the composition of the diet. Obesity, which occurs in the galah, amazon parrot, and budgerigars, can lead to fatty liver and lipoma. A gradual reduction in weight, by means of calorie restriction, is recommended. Commercially available nutritionally balanced bird food is often effective.
1998
Absorption and metabolism of carotenoids in birds, fish and crustaceans. Schiedt, K.; Britton, G (ed.); Liaaen, Jensen S.; Pfander, H. Carotenoids, v. 3: Biosynthesis and Metabolism, 1998, p. 285-358. ref. ISBN: 3764358297.
Descriptors: carotenoids, metabolism, retinoids, transport, distribution, plumage.
Abstract: A selective review concerning the absorption and metabolic transformation of carotenoids in animals excluding mammals, focusing on recent results using modern analytical methods from studies in birds, fish and crustaceans. Metabolic transformations of special interest are the oxidative and reductive transformation of the beta and epsilon end groups of various chiralities and the cleavage of carotenoids to retinoids.
Avian nutrition. Forbes, N.A. Voorjaarsdagen Congress 1998. Veterinary Quarterly, 1998, 20, Supplement, p. S64-S65. ISSN: 0165-2176.
NAL call no: SF601.V46
Descriptors: nutrition, aviary birds, diets, vitamins, dietary minerals, protein.
Avian nutrition: anatomy of the avian digestive system - Part 2. Klasing, K.C. Exotic Bird Report, May 1998, v. 10 (1), p. 4-6.
Descriptors: Aves, digestive system, anatomy, birds.
Comparative Avian Nutrition. Klasing, Kirk C. CAB International, Oxon & New York, 1998. i-ix. 350 pp. ISBN: 0851992196.
NAL call no: QL698.K58 1998
Descriptors: nutrition, digestive system, anatomy, physiology, Aves, textbook.
Contrasting digestive strategies of fruit-eating birds. Witmer, M.C.; Van Soest, P.J. Functional Ecology, Oct. 1998, v, 12 (5), p. 728-741. ISSN: 0269-8463.
NAL call no: QH540.F85
Descriptors: diet selection, digestive strategies, fruit, protein requirement, comparison study, lipid digestion, adaptions, Cedar Waxwings, Bombycilla cedrorum.
Abstract: 1. Sugary fruits dominate the annual diet of Cedar Waxwings (Bombycilla cedrorum), whereas lipid-rich foods dominate the diets of frugivorous thrushes. Nutrient utilization and preferences of Cedar Waxwings and thrushes fed sugary and lipid-rich natural fruits were assessed to ascertain the potential for nutrient-based specializations that could explain diet selection in nature. 2. Compared allometrically, Cedar Waxwings showed higher rates of sugar assimilation from sugary fruits than did thrushes, by virtue of higher intake rates, and achieved the highest energy assimilation rates from sugary fruits than did thrushes, by virtue of higher intake rates, and achieved the highest energy assimilation rates when eating a sugary fruit. A trade-off to this digestive strategy appears to be less efficient utilization of lipids when eating exclusively lipid-rich fruits. 3. Thrushes digested lipids more efficiently than Cedar Waxwings as a function of intake rate or estimated retention time, and thrushes achieved the highest energy assimilation rates when eating a lipid-rich fruit. Specialization to a diet rich in lipids appears to limit the rate at which sugary fruits can be processed. 4. Within each bird species, sugar digestive efficiencies were high and were not reduced at higher intake rates. Lipids were consumed at lower rates than sugars, and lipid digestive efficiencies declined with increasing intake rates. Frugivorous birds modulated digestive processing of fruits according to the time needed for efficient digestion and/or absorption of sugars and lipids, respectively. 5. Rate of nitrogen intake, not sugar assimilation, positively influenced body mass changes of birds. Sugary fruits appear nutritionally rich in energy, but limited in protein for avian frugivores. Relatively high intake rates and low protein requirements of Cedar Waxwings suggests that specialization to sugary, low-protein diets involves traits that facilitate acquisition and conservation of protein/amino acids. 6. Cedar Waxwings and thrushes show digestive specialization to the utilization of sugars and lipids, respectively, as dominant dietary nutrients. These traits explain patterns of food selection by these birds in the laboratory and in nature. Variation in the value of particular fruit nutrients to different birds renders the dietary descriptor of ‘frugivore’ ambiguous in a nutritional context.
Daily energy budgets of avian embryos: The paradox of the plateau phase in egg metabolic rate. Dietz, M.W.; Kampen, M. van; Griensven, M.J.M. van; Mourik, S. van; Van Griensven, M.J.M.; Van Mourik, S.; Van Kampen, M. Physiological Zoology, 1998, v. 71 (2), p. 147-156. ref. ISSN: 0031-935X.
NAL call no: QL1.P52
Descriptors: energy balance, metabolism, eggs, embryos, energy, models, galliform species, embryonic synthesis and maintenance.
Abstract: The metabolic rate of precocial bird eggs reaches a plateau when about 80% of the incubation period has passed. This is unexpected, as in many species the embryo continues to grow and maintenance costs must therefore increase. To investigate this paradox, daily energy budgets were constructed for embryos of 4 galliform species according to 2 models that used empirical data on egg metabolic rate and embryo growth. In the first model, embryonic synthesis costs were estimated, with an assumed synthesis efficiency, before calculating the maintenance costs. In the second model, embryonic maintenance was calculated first, and no assumptions were made on the synthesis efficiency. The calculations show that assumptions of the synthesis efficiency had a major impact on the energy budget calculations, because embryonic growth rate was high. During the plateau phase, a galliform embryo allocated energy in favor of its maintenance costs in three ways: by decreasing growth rate, by increasing synthesis efficiency, and by depressing the formation of glycogen. The results suggest that a reduction in growth rate plays a minor role. An increase of synthesis efficiency is more likely to explain the plateau in energy expenditure, since small increases in synthesis efficiency can lead to great savings on synthesis costs.
Diet, maternal condition, and offspring sex ratio in the zebra finch, Poephila guttata. Bradbury, R.B.; Blakey, J.K. Proceedings of the Royal Society of London, Biological Sciences, May 22, 1998, v. 265 (1399), p. 895-899. ISSN: 0962-8452.
NAL call no: 501 L84B
Descriptors: sex ratios, breeding, dietary intake, fitness, progeny, sex-biased mortality, quality of diets.
Abstract: Where maternal conditions affects condition and reproductive potential of offspring differentially with respect to sex, mothers in relatively good condition should produce more of the sex whose fitness is more dependent on condition. We experimentally manipulated body-condition in unmated zebra finches by feeding them for three months on high- or low-quality diets. Birds were then allowed to breed, while keeping the same diets. Females on the lower quality diet were in better condition and hatched significantly more males than females. Poorer conditioned females hatched an equal sex ratio. Chicks fed on low quality diet, but not on the high-quality diet, showed female-biased mortality. These results show that facultative sex ratio manipulation and sex-biased mortality can act together to produce extreme sex ratios in this vertebrate.
Determination of energy, protein and amino acid requirements for maintenance and growth in ostriches. Cilliers, S.C.; Hayes, J.P.; Chwalibog, A.; Sales, J.; Du Preez, J.J. Animal Feed Science and Technology, Jun. 1998, v. 72 (3-4), p. 283-293. ISSN: 0377-8401.
NAL call no: SF95 A55
Descriptors: animal husbandry, nutrition, dietary maintenance requirements, young animals.
Abstract: requirements for maintenance and utilization of dietary true meatabolisable energy, corrected for nitrogen (N)-retention (TMEn), effective energy, corrected for N-retention, protein and amino acids were assessed in 44 young ostriches (7 months of age) by means of a comparative slaughter technique. Response in nutrient gain (energy, lipid, protein and amino acids) in feathers, legs, hides and carcasses were separately studied by scarifying 8 birds at the beginning and 12 birds at the end of a 21-day feeding period. TMEn required for maintenance was 0.42 MJ/empty body weight (EBW),kg0.75/day or 7.96 MJ/day, while maintenance requirements for effective energy, corrected for N-retention, amounted to 0.311 MJ/EBW. Kg0.75/day of 8.90 MJ/day. Utilization deficiencies for TMEn were estimated as 0.414+0.016 (MJ/day), whereas a value of 0.568 +0.009 was determined for effective energy, corrected for N-retention. Digestible maintenance protein requirements of 0.678 +0.027 g/EBW. Kg0.75/day was found, and by altering this estimate to requirement for total dietary protein, 1.05+0.038 g/EBW, kg0.75/day was calculated. Maintenance requirements for lysine, methionine+ cystine, threonine and valine compared favourable to literature values for poultry, but substantially higher values than for poultry, however, were determined for lucine, arginine and histidine. Net utilisation estimates for digestible amino acids varied between 0.948+0.025 for the slow turnover amino acids (cystine) with a mean value of 0.747. Results in the present study presented essential information for the establishment of requirement estimates for ostriches.
Dietary flexibility and intestinal plasticity in birds: A field and laboratory study. Sabat, P.; Novoa, F.; Bozinovic, F.; Rio, C.M. del; Del Rio, C.M. Physiological Zoology, 1998, v. 71 (2), p. 226-236. ref. ISSN: 0031-935X.
NAL call no: QL1 P52
Descriptors: feed intake, enzymes, digestion, intestines, digestive tract, modulation of intestinal enzymes by diet, hydrolases, Zonotrichia capensis, Diuca diuca, Z. capensis.
Abstract: The adaptive modulation hypothesis posits that the expression of digestive proteins should be modulated in response to intake of their respective substrates. A corollary of this hypothesis suggests that dietary flexibility and digestive plasticity should be correlated. Both hypotheses were examined in 2 granivorous Chilean birds (Zonotrichia capensis and Diuca diuca) that differ in dietary breadth. D. dicua is a strict granivore, whereas Z. capensis also eats insects. In field-caught birds, the activity of the intestinal dipeptidase aminopeptidase-N was positively correlated with intake of insects in Z. capensis but not in D. dicua. This is the first field documentation of modulation of intestinal enzymes by diet in birds. Intestinal maltase and sucrase activities were not correlated with seed (vs. insect) intake in either species. In the laboratory, both species exhibited similar modulation of membrane-bound intestinal hydrolases when fed on synthetic diets of contrasting carbohydrate and protein composition. Maltase, sucrase and aminopeptidase-N activities were significantly higher in birds fed on the carbohydrate-free than those on the carbohydrate-containing diet. Activities of the 3 enzymes were positively correlated. This increase was attributed to nonspecific increases of all enzymes resulting from intake of the carbohydrate-free diet. Principal components analysis separating the effect of diet on specific and on nonspecific modulation revealed that diet had a strong effect on nonspecific activity of intestinal enzymes in both Z. capensis and D. diuca. Diet also significantly affected aminopeptidase-N activities when the effect of diet on nonspecific modulation was removed. Birds fed on the carbohydrate-free, high-protein diet had significantly higher specific aminopeptidase-N activities than those fed on the carbohydrate-containing diet. The results cast doubts on the notion that dietary flexibility and the plasticity of the gut’s enzymes are necessarily correlated and on the general validity of the adaptive modulation hypothesis.
Ecological and evolutio