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Protein Depletion and Amino Acid Requirement in the Growing Chicken¹

Department of Poultry Science, Rutgers University, New Brunswick, New Jersey

The methionine and lysine requirement of normal and protein-depleted chicks was determined on diets containing 20% of protein. For both amino acids a higher absolute requirement could be demonstrated for the depleted birds. Data are presented which explain these findings on the basis of a greater protein requirement for the depleted chicks. Thus, for lysine, the requirement for depleted and non-depleted chicks remained essentially constant when expressed on the basis of the dietary protein level required for maximum growth.

Manuscript received 28 March 1959.

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