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The Influence of the Non-Essential Amino Acids on the Requirement of the Adult Rat for Isoleucine, Methionine and Threonine

Bureau of Human Nutrition and Home Economics, Agricultural Research Administration, United States Department of Agriculture, Washington, D. C.

Experiments have been conducted to determine the influence of the non-essential amino acids on the amounts of methionine, isoleucine and threonine required to maintain adult male rats in nitrogen equilibrium. Cystine was the only non-essential amino acid which influenced the amount of methionine required for this purpose. In the absence of cystine, an intake of 14.6 mg DL-methionine was required; when the animals received 10 mg of L-cystine, 4.2 mg DL-methionine were sufficient; and when the cystine ingested was increased to 21 mg per day, 3.2 mg DL-methionine were needed for maintenance of nitrogen equilibrium. The isoleucine and threonine requirements, 11 and 10 mg per day, respectively, were unaffected by the non-essential amino acids at the levels of intake used.

² Present address: Division of Animal Nutrition, University of Illinois, Urbana.

Manuscript received 2 October 1952.