Abstract
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.
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