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Requirement of Tryptophane by the Chick

One Figure

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

Use of a diet containing a mixture of 20 amino acids or one containing zein and gelatin supplemented with some pure amino acids as the only protein source has shown dl-tryptophane to be only half as effective as l (-)-tryptophane in promoting growth and efficient food utilization in the chick. From the results obtained with these diets, the l (-)-tryptophane requirement is shown to be approximately 0.25% of the diet.