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Journal of Nutrition Vol. 102 No. 11 November 1972, pp. 1471-1476
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Fungal-treated Cottonseed Meal for Swine

E. T. Kornegay, R. F. Kelly, T. C. Campbell, K. G. Libke, F. W. Sandrock and J. E. Blair1

Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 and Biochemical Corporation of America, Salem, Virginia 24153

Forty growing pigs were used to evaluate the detoxification of gossypol in cottonseed meal using Diplodia inoculation. The following dietary treatments were used: 1) uninoculated soybean meal (control), 2) Diplodia-inoculated soybean meal, 3) uninoculated cottonseed meal, 4) Diplodia-inoculated cottonseed meal, and 5) uninoculated cottonseed meal plus ferrous sulfate. Corn was the major source of energy in all rations with all rations being fortified with minerals and vitamins. Diets 3, 4 and 5 were calculated to contain 0.054% free gossypol. Based upon improved daily gain, diet intake and feed efficiency and reduced mortality rate, fermentation with Diplodia and the addition of ferrous sulfate were both effective in detoxifying gossypol. Liver free and bound gossypol levels were lower for the fermented cottonseed meal diet. There was no evidence for an unidentified growth factor. Chemical composition and amino acid content of the meals were not changed by inoculation. A large amount by weight of the meals was lost during fermentation, 44 and 25%, respectively, for soybean and cottonseed meals.

KEY WORDS: • cottonseed meal • fungal detoxification • gossypol • swine

1 Departments of Animal Science, Food Science and Technology, Biochemistry and Nutrition, Veterinary Science and Animal Science, Virginia Polytechnic Institute and State University, and Biochemical Corporation of America, respectively, for Kornegay, Kelly, Campbell, Libke, Sandrock and Blair.

Manuscript received 4 March 1971.




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