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Influence of High Protein Diets on Vitamin A Metabolism and Adrenal Hypertrophy in the Chick

Department of Poultry Husbandry and Graduate School of Nutrition, Cornell University, Ithaca, New York

High dietary levels of isolated soybean protein, purified isolated soybean protein, casein-gelatin, vitamin-free casein, or amino acid mixtures formulated to simulate isolated soybean protein were administered to chicks. When adequate dietary intake of the high protein diets was obtained, a significantly decreased liver vitamin A storage was observed as compared with that of pair-fed chicks consuming the same protein at moderate dietary levels. Isolated soybean protein diets had the most marked effects in reducing vitamin A liver stores. The depletion of vitamin A ester in the liver was more complete than the depletion of vitamin A alcohol. Enlargement of the adrenal glands occurred in chicks consuming the high isolated soybean protein diets. This enlargement appeared to be due primarily to hypertrophy of the adrenal cortical tissue.