Studies on the Requirement of the Chick for Tryptophane

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Abstract
Chicks were fed a purified, tryptophane-low diet in which the major sources of protein were 12% oxidized casein and 10% gelatin supplemented with cystine and methionine. Chicks grew normally when an adequate amount of tryptophane was added to this diet. Using this ration with graded levels of tryptophane and a ration in which untreated casein supplied the tryptophane, the l(-)tryptophane requirement of the New Hampshire × White Leghorn crossbred chick and the White Leghorn chick was shown to be 0.18% of the diet.
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