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Effect of Tannin Extraction on the Performance of Chicks Fed Bird Resistant Sorghum Grain Diets

1974; Elsevier BV; Volume: 53; Issue: 2 Linguagem: Inglês

10.3382/ps.0530714

1525-3171

W. D. Armstrong, J.C. Rogler, W.R. Featherston,

Ruminant Nutrition and Digestive Physiology

Three experiments were conducted to determine the effects on chick performance of extracting the tannin from bird resistant sorghum grains BR64, IS8260 and IS6992 as well as non-resistant sorghums RS610 and RS671. The procedure, involving alkaline treatment of whole grain followed by hot water washing, removes most of the tannins from bird resistant sorghums and renders them equivalent in tannin content to non-resistant sorghums. Comparisons among sorghum grains were made on an isonitrogenous basis in a sorghum-soybean meal diet at sub-optimal protein levels. Extraction of the tannins from bird resistant sorghums BR64 and IS8260 resulted in significantly better chick growth and feed conversion as compared with that of chicks fed the intact bird resistant sorghum diets. Performance with these treated bird resistant sorghums was approximately equal to that obtained with intact non-resistant sorghums. The extraction process did not significantly influence growth rate but did significantly improve feed conversion of the non-resistant sorghum grains. Supplementation of the sorghum IS8260 diet with methionine resulted in a significant improvement in chick performance and an increased incidence and severity of a leg abnormality as compared with the unsupplemented IS8260 diet. Methionine supplementation of a diet containing sorghum IS8260 after extraction of the tannin resulted in similar leg scores and only a slight improvement in performance as compared with the same diet without added methionine.