Effect of Bound Gossypol on the Growth-Promoting Properties of Cottonseed, Soybean and Peanut Meals

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Abstract
The objective of this study was to determine the effect of gossypol bound to oil-seed meals on the growth-promoting properties of the meals. A method for binding the gossypol to the meal without impairing the apparent growth-promoting properties of the meal in the absence of gossypol has been developed. Cottonseed, soybean and peanut meals, untreated and treated for binding either with or without added gossypol, were compared in diets in which the respective meals supplied all the protein at the 10% level. The meals were assayed by feeding the various diets to weanling rats during a 4-week period. There were no differences in the growth of rats consuming the untreated and treated control meals. The growth from the meals supplying the bound gossypol at the rate of 0.183 to 0.237% of the diet was significantly lower than growth from the corresponding controls. Cottonseed meals, treated for binding with or without added gossypol, were supplemented with either lysine, methionine or tryptophan individually or the three in combination. Improvement of growth was reflected significantly only from lysine supplementation of the diets containing bound gossypol. At the 20%-protein level in the diet, there was little difference in the growth response from cottonseed meal with or without bound gossypol, indicating that at higher protein levels the amino acid requirements are more adequately met than at the 10% protein level.