Abstract

SummaryGuinea pigs fail to grow on a corn-soybean oil meal-alfalfa ration even when adequate amounts of vitamins A, D, E, and C are supplied. The survival and blood picture of the animals are improved by the addition of a mixture of crystalline water soluble vitamins of which niacin appears to be an important, but not the only, active component. Linseed oil meal, soybean oil meal, and casein supplements promote growth and blood formation approaching that of animals on stock ration. The potency of these substances is proportional to their tryptophane content and may be replaced in part by pure tryptophane.

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