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Destruction of Rachitogenic Activity of Isolated Soybean Protein by Autoclaving as Demonstrated with Turkey Poults^{1, 2,}

South Dakota State University, Brookings, South Dakota

Investigations were conducted to determine the effect of increasing vitamin D₃ levels and the effect of autoclaving on the rachitogenic activity of isolated soybean protein (C-1 protein—Skidmore). One-day-old poults were fed purified diets of the glucose-C-1 protein type. The diets contained calcium, phosphorus and vitamin D₃ at levels equal to or greater than National Research Council recommendations. These results demonstrate that autoclaving destroys rachitogenic activity exhibited by C-1 protein. Autoclaving C-1 protein increased tibia ash values, and concomitantly serum alkaline phosphatase activity was decreased. However, autoclaving the C-1 protein for 60 minutes was most effective in reducing the rachitogenic effects of C-1 protein. In 2 out of 3 experiments, use of autoclaved C-1 protein in the diet also increased weight gains and serum calcium levels. In general, increasing dietary levels of vitamin D₃ lowered serum alkaline phosphatase activity. The effects of increasing vitamin D₃ levels on weight gains, bone ash and serum calcium were variable between experiments. Neither autoclaved C-1 protein nor increasing vitamin D₃ levels had any effect on serum inorganic phosphate.

² Approved for publication by the Director of the South Dakota Agricultural Experiment Station as Paper no. 778 of the Journal series.

Manuscript received 10 July 1967.