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Studies of Amino Acid Diets for the Chick

Laboratory of Nutrition and Endocrinology, National Institute of Arthritis and Metabolic Diseases, Public Health Service, U. S. Department of Health, Education and Welfare, Bethesda, Maryland

Day-old female New Hampshire chicks fed a diet containing the amino acid mixture of Fisher and Johnson ('56) as the sole source of protein grew as well up to two weeks of age as chicks receiving a similar complete diet containing casein, gelatin, and methionine. Between two and 4 weeks the growth of chicks fed the amino acid diet fell considerably below that of the chicks fed the purified protein diet. The addition of 10% casein to the amino acid diet resulted in growth equal to that of the controls; part of the activity of casein could be attributed to its amino acid content. When the amino acid diet contained 12% of fat, growth was superior to that obtained when the diet contained 4% of fat.

This highly improved amino acid diet provides an opportunity for study of unrecognized factors and for determining amino acid requirements and interrelationships.