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Effect of Bound Gossypol and Amino Acid Supplementation of Glandless Cottonseed Meal on the Growth of Weanling Rats^{1 ,2,}

North Carolina State University, Raleigh 27607

Abstract

After a feeding study comparing the growth response of rats fed a 10% protein diet of glandless cottonseed meal with the same meal to which gossypol had been bound showed the latter produced significantly lower weight gains, two experiments were conducted in which the diets were supplemented with single amino acids. The amino acids were either L-lysine, L-isoleucine, L-valine or L-threonine and were included at the level to bring the dietary level to that recommended for young rats. In a third experiment L-methionine was added to the above list of amino acids. In a fourth experiment the five amino acids were included in combination at the levels they were supplemented individually. In experiments 2 and 3 there were significant differences between the corresponding gossypol-free and the bound gossypol-containing diets. There was no difference between the gossypol-free and gossypol-containing control diets and the respective diets supplemented with an amino acid. In experiment 4 amino acid supplementation did not improve gains above the gossypol-free control, but did significantly improve gains for the gossypol-containing diet.

¹ Paper No. 4771 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, NC. Supported in part by Public Health Service Grant No. AM-07039. Use of trade names in this publication does not imply endorsement of the products mentioned.

² The material in this paper was presented to the graduate faculty of North Carolina State University by Lynn A. Jones in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Animal Science.

³ Present address: The National Cottonseed Products Ass., P. O. Box 12023, Memphis, TN 12023.