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The Amino Acid Requirements of the Chick

Three Figures

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

Mixtures of 20 amino acids have been used in complete replacement of protein in chick diets. Of these amino acids, alanine, aspartic acid, hydroxyproline, proline, norleucine and serine have been shown to be dispensable. The essential nature of glycine in promoting best growth has been confirmed; glutamic acid appears similar to glycine in this regard. Tyrosine appears to be required if only moderate levels of phenylalanine are used, but seems to be dispensable when higher levels are used. Leucine, phenylalanine, threonine and valine have been shown to be necessary dietary components to prevent weight loss, while the similar status of histidine and isoleucine has been confirmed.