The overall objective is to evaluate hen performance and well-being, as well as egg safety, quality, and functionality of four different strains of laying hens in an aviary housing system. The specific objectives that will help to achieve the overarching objective include: 1. Evaluate performance and assess hen well-being; 2. Assess impacts on egg quality and functionality of fresh and stored eggs; and 3. Assess impacts on the shedding of Salmonella spp., as well as environmental and egg microbiology.