Diets used in these studies were made very high in percentage of such constituents as protein, minerals and vitamins in order to insure an adequate ingestion of these essentials. The retardation is effected by the deficiency in the daily allowance of energy in the diet. In the present study every animal was given the same daily allowance of the basal diet. Animals permitted t o grow normally were given additional calories.The amount of this diet fed to individuals daily was determined by the amount needed to maintain the retarded animals at a stationary body weight. The results of such a regime insure the ingestion of
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