The Effect of Protein Level on the Tryptophan Requirement of the Growing Chick

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Abstract
The dietary tryptophan requirement of growing male cross-bred chicks has been shown to increase with increasing protein levels, though at a slower rate than the latter. When the diet contained 10, 20, 30 or 40% protein, the minimum requirement for tryptophan was estimated to be 0.09, 0.143, 0.182, and 0.20% of the diet respectively. Thus, a protein causing a slight tryptophan deficiency when incorporated into a diet at the 20% level might conceivably supply sufficient tryptophan for optimum growth when incorporated into the diet at a higher level. Supplementation with an antibiotic did not appear to have a sparing effect on the requirement for dietary tryptophan.
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