Rachitogenic Activity of Soybean Fractions

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Abstract
Isolated soybean protein and raw soybean meal were shown to possess growth-depressing and rachitogenic properties when used in a glucose-soybean protein-type diet for turkey poults to 4 weeks of age. Vitamin D3 was supplied at the level of 880 ICU/kg. The rachitogenic effects of isolated soybean protein could be largely overcome by an eightfold increase in vitamin D3 supplementation or by autoclaving the isolated soybean protein. However, maximal growth and bone ash were obtained only when heated soybean meal was included in the diet. The growth-depressing and rachitogenic effects of raw soybean meal were only partially overcome with a tenfold increase in vitamin D3 supplementation, whereas autoclaving the meal overcame both effects.