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Transmissibility of BSE to Pigs by Oral Exposure to Brain Homogenate

Institutions
Veterinary Laboratories Agency, UK
Start date
1995
End date
2003
Objective
This research project aims to determine whether BSE can be transmitted to pigs by including infected material in their feed.

The UK pig herd have historically been exposed to BSE infectivity in the form of meat and bone meal from cattle. This study investigates whether transmissibility of BSE to pigs can occur by oral challenge of BSE-infected material.

More information
Piglets were bred and fed only a ration free of meat and bone meal. After weaning at 7-8 weeks, challenge and control groups, each of ten piglets, were selected. The exposure dose was then calculated on the basis of replacing the theoretical maximum daily intake of meat and bone meal for the age of pig under commercial dietary conditions with an equivalent weight of brain tissue.

Consequently, a pool of homogenised brains was prepared from confirmed BSE cases and 4kg of this, mixed with the normal ration, was fed to the challenge group on three occasions at 1-2 weekly intervals commencing at 8 weeks of age (May/June 1990). On each occasion, the pigs were observed to confirm that all had consumed the feed. Control pigs received only the normal ration. Find more about this project and other FSA food safety-related projects at the Food Standards Agency Research webpage.

Abstract
Experimental oral exposure at eight weeks of age, with brain homogenate derived from natural cases of BSE, failed to produce evidence of the disease in pigs retained up to 7 years after exposure. No infectivity was found in a range of neural and non-neural tissues collected from these animals at 2 years after exposure or at termination.
Funding Source
Food Standards Agency
Project number
M03004
Categories
Sanitation and Quality Standards
Bacterial Pathogens
Commodities
Meat, Poultry, Game