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Postruminal Digestion of Corn Starch in Steers¹

University of Kentucky, Lexington

Abstract

The digestion of starch posterior to the rumen of steers was estimated following infusions of 200, 400 and 600 gm. purified corn starch into the abomasum twice daily. As the level of infusion was increased more starch was recovered in the posterior ileum, indicating reduced digestibility of the higher levels. Recovery of starch in the feces was lower but also increased with higher levels of infusion. Glucose levels in jugular blood at various times after starch infusion were not elevated, suggesting that starch was not rapidly hydrolyzed in the intestine.

¹ The investigation reported in this paper (No. 67-5-9O) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director. Supported in part by contract No. AHd2–39 (C) with the Beef Cattle Research Branch, Animal Husbandry Research Division, Agricultural Research Service, U. S. Department of Agriculture.

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				C. J. Richards, A. F. Branco, D. W. Bohnert, G. B. Huntington, M. Macari, and D. L. Harmon Intestinal starch disappearance increased in steers abomasally infused with starch and protein J Anim Sci, December 1, 2002; 80(12): 3361 - 3368. [Abstract] [Full Text] [PDF]