Abstract
Grain sorghum diets with 0, 5, 10 and 15% soybean, seeds without hulls, solvent extracted, maximum 3% fiber (Ref. no. 5-04-612), (Soybean meal) supplementation using genotypes containing less than 1.0 or more than 4.0 catechin equivalents (tannins) were fed to weanling rats. Thirteen-day weight gains of 36 g and 28 g, feed consumption of 155 g and 170 g and feed efficiency ratios of 6 and 17 were highly significant for low and high tannin genotypes, respectively. Weight gains of 7, 27, 42 and 53 g, feed consumption of 145, 169, 168 and 166 g and feed efficiency ratios of 21, 6, 4 and 3 were obtained for the four levels of soybean meal supplementation, respectively. Average rat weight gains from the high tannin genotypes differed significantly from the low tannin rat gains for 0, 5 and 10% soybean meal supplemented diets, respectively, but the gains from the 15% soybean meal diets were not significantly different. Feed consumption of the high tannin diets was greater or equal to the low tannin diets. The lack of antagonistic interactions with supplemental protein for weight gain, feed efficiency and feed consumption indicated that protein from soybean meal can be supplemented without changing the relative performance of different sorghum genotypes. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.