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The Phenylalanine and Tyrosine Requirement of the Growing Chick with Special Reference to the Utilization of the D-Isomer of Phenylalanine¹

Poultry Science Department, Rutgers University, New Brunswick, N. J.

The utilization of D-phenylalanine as well as the requirements for L-phenylalanine and L-tyrosine by growing chicks were the subject of this report. It was found that D-phenylalanine is very poorly utilized as indicated by slow growth obtained with the D-isomer alone as well as by a higher requirement for DL-phenylalanine than for the L form. The L-phenylalanine requirement of chicks is approximately 0.5% and the L-tyrosine requirement is not more than 0.5%. It is suggested that these values be adopted in place of the old values of 0.9% and 0.7% based on former work.

Manuscript received 17 January 1957.

This article has been cited by other articles:

				F. M. Lartey and R. E. Austic Phenylalanine Requirement, Imbalance, and Dietary Excess in One-Week-Old Chicks: Growth and Phenylalanine Hydroxylase Activity Poult. Sci., February 1, 2008; 87(2): 291 - 297. [Abstract] [Full Text] [PDF]