I . Pooled samples of eggs from White Leghorn and New Hampshire hens given diets containing 110 and zoo g protein/kg were analysed for their content of essential amino acids. 2. The amino acid composition of the hen’s egg protein was not significantly affected by variations in breed and diet. 3. The estimated values for lysine, total sulphur-containing amino acids and tryptophan in egg protein ...

Cross-reactivity among four species of ruminal bacteria was examined by using egg yolk antibodies from immunized Leghorn laying hens and an enzyme-linked-immunosorbent assay. The effects of the four species on the hens were compared on various days postimmunization. Hens injected with the same bacterial species had similar apparent antibody levels over the entire postimmunization period, but on...

One-day-old specific-pathogen-free White Leghorn chicks were inoculated orally with Salmonella enteritidis phage type 4 to study adhesion and invasion of the ceca by immunohistochemistry. Positive staining bacilli were associated with the epithelial surface and were present in the lumen of the cecal crypts. They were observed in the interstitial tissue and in the cytoplasm of macrophage-like ce...

The chorio-allantoic membranes of White Leghorn chick embryos at 10 to 12 days after laying were fixed in Palade's buffered osmium tetroxide or in Luft's potassium permanganate. After fixation in these two ways the general appearance is similar, but there are differences in certain tissue elements. Cell membranes are well preserved after fixation in KMnO4. Certain lipid inclusions in the cytopl...

595 Influence of soy oil source and supplementation of the diet with vitamin E and vitamin C on performance and egg quality of Single Comb White Leghorn laying hens from forty four to fifty six weeks of age. H. Irandoust1, A. H. Samie1, H. R. Rahmani1, J. Pourreza1, M. Kadivar2, M. A. Edriss1, P. García-Rebollar3, and G. G. Mateos*3, 1Department of Animal Sciences, Isfahan University of Technol...

H5N2 strains of low-pathogenicity avian influenza virus (LPAIV) have been circulating for at least 17 years in some Mexican chicken farms. We measured the rate and duration of viral excretion from Pekin ducks that were experimentally inoculated with an H5N2 LPAIV that causes death in embryonated chicken eggs (A/chicken/Mexico/2007). Leghorn chickens were used as susceptible host controls. The d...