title: Appearance of D-alloisoleucine in the blood plasma of laying hens.
abstract: Two strains of laying chickens were used to investigate the effects of amino acid additions, including D-alloisoleucine, to a low protein corn-soy diet on plasma free amino acids and egg albumen amino acid composition. Intake of .1% D-alloisoleucine with the L-form in the mixture resulted in appearance of this compound in the plasma but not in egg albumen. The concentration of plasma valine was significantly increased when the amino acid (.2% D-L) was added to the 10% protein diet. Threonine and arginine additions did not increase the concentration of the respective amino acid in the plasma significantly. The amino acid composition of egg albumen remained unaffected by dietary supplementation. Production data along with amino acid composition of egg albumen showed that the laying hen reduces production rather than altering amino acid composition of egg albumen protein in its response to reduced uptake. No apparent strain differences were noted.
mesh_terms: D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000097:blood*; D004032:Diet; D007532:Isoleucine / Q000097:blood*
chemical_list: D007532:Isoleucine