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Department of Poultry Science, Washington State University, Pullman, Washington
Significant growth inhibition, pancreatic hypertrophy and reduced feed efficiency resulted when diets containing hexane-extracted raw soybean meal or ground soybeans were fed to chicks. Three levels of protein, 15, 20 and 25%, were fed in which the soybean meal of the diet was varied from all raw-to-heated meal in ratios of 100:0, 75:25, 50:50, 25:75, and 0:100. All diets contained adequate amounts of supplemental DL-methionine. Improvement of chick growth as a result of heat treatment of raw soybean meal was obtained at all levels of protein. Adding isolated autoclaved soybean protein to a raw soybean meal diet containing 25% of protein to provide up a 45% of dietary protein did not improve growth rate of chicks. Feed consumption for chicks fed raw meal was about the same as that for chicks fed autoclaved meal.
Manuscript received 29 January 1962.