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Further Studies on Cystine, Methionine and Choline in Chick Diets

Division of Poultry Husbandry, University of California, College of Agriculture, Berkeley

Through the use of a diet deficient in methionine and cystine, experiments were conducted in which the levels of cystine were increased gradually up to the optimal sulfur amino acid content, with various levels of choline additions. With levels of choline chloride as high as 0.6%, the growth obtained was no better than 4% per day, while substitution of part of the cystine by methionine so that the total methionine content of the diet was 0.55%, gave optimal gains of 6% per day. Cystine apparently cannot compensate for a methionine deficiency, even if high levels of choline are employed.