Further Studies on the Effects of Different Processing Temperatures on the Utilization of Solvent-Extracted Cottonseed Protein by Sheep

Abstract

Digestibility, nitrogen-retention and growth trials were conducted to study the effects of various heat treatments upon sheep utilization of cottonseed protein. Cottonseed meal was produced by cold-hexane extraction with no heat being applied during extraction. Portions of this meal were then subjected to the following heat treatments (1) no heat, (2) autoclaved under 15 lb. steam pressure per square in. at 250° F. for 20 min., (3) for 60 min., (4) for 120 min., (5) for 180 min. and (6) for 240 min. The effect of increased autoclaving time, when fecal nitrogen loss (increased) and urinary nitrogen loss (decreased) were considered, did not differ from linearity. Nitrogen retention expressed as a function of intake, however, contained a cubic component which was caused by greatest retention for the 60-min. autoclaved meal and decreased retention with the longer autoclaving times. Autoclaving the raw cottonseed meal for 60 min. improved sheep gains and feed efficiencies significantly, when compared to the unheated meal and the meals autoclaved for 120 and 240 min. Copyright © 1964. American Society of Animal Science . Copyright 1964 by American Society of Animal Science