Amino acid requirements of growing chickens.
1. Using 18% protein diets (N times 6-25), consisting mainly of conventional ingredients of known amino acid composition, the amino acid requirements as percentages of diet and of dietary protein respectively for broiler chickens between 14 and 28 d of age were found to be: threonine 0-50-0-52% of diet (2-8-2-9% of dietary protein); glycine 0-48-0-50 (2-7-2-8); valine 0-69-0-71 (3-8-3-9); methionine+cystine 0-58 (3-2); isoleucine smaller than 0-48 (smaller than 2-7); leucine smaller than 1-05 (smaller than 5-8); tyrosine+phenylalanine 1-09-1-12 (6-1-6-2); lysine 0-87 (4-8); histidine smaller than 0-34 (smaller than 1-9); arginine smaller than 0-76 (smaller than 4-2); tryptophan smaller than 0-14 (smaller than 0-78). 2. Values found were in general lower than those determined using diets consisting entirely of purified amino acids and the reasons for this are discussed.
D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed / Q000032:analysis; D000818:Animals; D001120:Arginine / Q000378:metabolism; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D003553:Cystine / Q000378:metabolism; D004044:Dietary Proteins / Q000032:analysis / Q000378:metabolism; D005998:Glycine / Q000378:metabolism; D006639:Histidine / Q000378:metabolism; D001467:Hordeum / Q000032:analysis; D007532:Isoleucine / Q000378:metabolism; D008239:Lysine / Q000378:metabolism; D008715:Methionine / Q000378:metabolism; D009584:Nitrogen / Q000032:analysis; D009751:Nutritional Requirements; D013912:Threonine / Q000378:metabolism; D014908:Triticum / Q000032:analysis; D014364:Tryptophan / Q000378:metabolism; D014633:Valine / Q000378:metabolism
D000596:Amino Acids; D004044:Dietary Proteins; D007532:Isoleucine; D013912:Threonine; D003553:Cystine; D006639:Histidine; D014364:Tryptophan; D001120:Arginine; D008715:Methionine; D014633:Valine; D008239:Lysine; D009584:Nitrogen; D005998:Glycine