Protein, Carbohydrate and Fat Content of the Diet of the Rat as Related to Growth

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Abstract
Addition of 9% corn oil to the diet of rats receiving suboptimal protein and corn starch as a source of carbohydrate decreased food consumption and depressed growth. These effects were not observed if glucose replaced starch in the diet. Improvement of the protein of the diet quantitatively or qualitatively eliminated the difference in performance of animals receiving starch and glucose. Replacement of corn oil by other fats caused growth depression of rats receiving a starch diet. Linseed oil and cod liver oil also caused a growth depression in glucose low-protein diets. Addition of chlortetracycline eliminated the growth-depressing effect of adding corn oil to the diets of low-protein starch fed rats. Oxytetracycline, penicillin, neomycin, streptomycin and succinylsulfathiazole were less effective or without effect.

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