Inadequacy of Certain Natural Diets for Guinea Pigs.

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Abstract
Guinea pigs fail to grow and develop moderate anemia and leuco-penia on a corn-soybean oil meal-alfalfa-mineral ration even when adequate amts. of vits. A, D, E, and C are supplied. The survival and blood picture of the animals are improved by the addition of a mixture of the crystalline water soluble vits. of which niacin appears to be an important, but not the only component. Linseed oil meal, soybean oil meal and casein supplements promote growth and blood formation approaching that of animals receiving a commercial pelleted guinea pig feed used as the standard for growth and blood formation. The potency of these substances is proportional to their tryptophane content and may be replaced in part by pure tryptophane.

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