Effect of Raw Soybean Meal on Growth of the Chick

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Abstract
Exclusively soybean protein diets containing varying proportions of raw to cooked soybean meals were fed to young chicks. The growth inhibition associated with raw soybean meal was almost fully developed when 1/4 of the protein of either 20% or 30% protein diets was supplied in the raw form. The results do not fit the concepts of an unavailable essential nutrient or of a toxic component in raw soybean meal. The results are explainable on the basis of an antitrypsin which readily inactivates trypsin but permits the remaining proteolytic system in the digestive tract to function at a lowered degree of efficiency. The further slight inhibition of growth with increased proportions of raw soybean meal is probably an effect of an entirely different nature and may be a manifestation of generally decreased availability of the nutrients in the raw meal.

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