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Effect of Gossypol and Heat on the Digestibility and Utilization of Soybean Protein by Sheep

Oklahoma Agricultural Experiment Station,^{,2, 3,} Stillwater

Abstract

Twenty-four lambs, six per treatment, were used in a 2 x 2 factorial arrangement of treatments to determine the effects of heating and adding gossypol to soybean protein. Heating alone or the addition of 1% gossypol acetic acid had no significant effect upon the digestibility of protein, however the combination significantly reduced protein digestibility.

Urinary nitrogen excretion was increased when gossypol was added to the soybean protein, but nitrogen retention was reduced significantly only when the protein-gossypol mixture was autoclaved.

¹ Present address, Houston, Texas.

² Department of Animal Husbandry, Stillwater, Approved by the Director.

³ Partial financial support provided by G. A. Harper, National Cottonseed Products Association, Inc., Dallas, Texas.