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Commercially Processed Glandless Cottonseed Meal for Starter, Grower and Finisher Swine¹

Texas Agricultural Experiment Station², College Station 77843

Abstract

Growth trials with weaned pigs (28 d old and 7.5 kg initially) and growing-finishing pigs (19 to 97 kg), plus a digestion trial were conducted to evaluate the nutritional value of commercially processed glandless cottonseed meal (GCSM). The GCSM contained 43% protein, 15.5% fiber, 1.62% lysine and .038% total gossypol. In the growth trials, GCSM was substituted in 20% increments for 0 to 100% of the supplemental protein in corn-soybean meal-based diets. Crystalline lysine was added to all GCSM diets to make them isolysine with the control corn-soybean meal diets. Increasing increments of GCSM resulted in linear reductions (P<.01, P<.05 or P<.10) in daily gain and linear increases (P<.01, P<.01 and P<.05) in feed/gain for pigs during the starter, grower and finisher trials, respectively. However, examination of the data indicated similar performance for pigs fed 0 to 40% supplemental GCSM protein, and only at the 60 to 100% levels was performance substantially reduced. Results from all growth trials indicated that GCSM plus lysine can be used to replace at least 40% of the supplemental protein in corn-soybean meal-based diets without affecting performance. Results of the digestion trial indicated similar or greater digestibilities of N and all essential amino acids for GCSM than soybean meal when measured at the end of the small intestine. The one exception was lower (P<.01) lysine digestibility (77.4 vs 84.0%) for GCSM. Estimated digestible lysine contents were similar for the soybean meal control diets and GCSM-containing diets of the growth trials, suggesting that some other factor was responsible for the lowered performance at the higher levels of GCSM.

¹ T. A. 19653. Texas Agr. Exp. Sta. Gratitude is expressed to Cotton, Inc., Raleigh, NC, for financial support of the growth trials, and to the National Cottonseed Products Assoc, Memphis, TN, for support of the digestion trial.

² Dept. of Anim. Sci.