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The ideal ratio between lysine, methionine, threonine, tryptophan, isoleucine and arginine in laying-hen diets


The ideal ratio between lysine, methionine, threonine, tryptophan, isoleucine and arginine in laying-hen diets



Journal of Animal Physiology and Animal Nutrition 73(4): 190-201



ISSN/ISBN: 0931-2439

The ideal dietary ratio between lysine, methionine, threonine, tryptophan, isoleucine and arginine for laying hens was determined by measuring the reduction in nitrogen retention that takes place when feeding diets in which the content of one single amino acid was reduced in each diet. A total of eight diets were therefore given to nine light-white hens (28-weeks old) for 54 days. The amino-acid concentrations in one diet (positive control= K+) met the requirements, while, in six diets, the concentration of a single amino acid (lysine (diet Lys), methionine (diet Met), threonine (diet Thr), tryptophan (diet Trp), isoleucine (diet Ile) and arginine (diet Arg)) was reduced by about 25 % relative to diet K+. In the eighth diet (negative control = K -), the concentrations of all essential amino acids reached only 75 % of the level in diet K+ (positive control). The partial deletion of single amino acids caused a reduction in egg production, feed intake and nitrogen retention, as well as a poorer feed conversion and reduced development of body mass in the hens. Lowering amino-acid supply generally decreased the concentrations of these amino acids in the blood plasma of the hens. The results of total nitrogen retention suggested that the ideal ratio of lysine: methionine: threonine: tryptophan: isoleucine: arginine is 100: 44: 74: 16: 76: 82. This result is compared to egg protein and some other amino-acid recommendations. The advantages and possible sources of error of the method are mentioned.

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Accession: 009585149

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