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Effect of Supplemental Protein on the Nutritive Value of High and Low Tannin Sorghum Bicolor (L.) Moench Grain for the Growing Rat¹

Purdue University, W. Lafayette, Indiana 47907

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.

¹ Contribution from the Purdue University Agricultural Experiment Station, West Lafayette, Indiana 47907. Journal Paper No. 5083. Supported by the United States Agency for International Development under contract csd-1175 entitled "Inheritance and Improvement of Protein Quality and Content in Sorghum bicolor (L.) Moench."

² Former Graduate Assistant, Department of Agronomy, presently staff member with the Brazilian Special Program for Agricultural Research.

³ Research Agronomist, Department of Agronomy.

⁴ Associate Professor, Department of Agronomy.

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