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Intestinal starch disappearance increased in steers abomasally infused with starch and protein^1,2

C. J. Richards^*,3, A. F. Branco^*, D. W. Bohnert^*,4, G. B. Huntington, M. Macari and D. L. Harmon^*,5

^* Department of Animal Sciences, University of Kentucky, Lexington 40546-0215, and North Carolina State University, Raleigh 27695-7621, and Universidade Estadual Paulista-UNESP, Brazil

⁵ Correspondence:
814 W.P. Garrigus Bldg. (phone: 859-257-7516; fax: 859-257-3412; E-mail:
dharmon{at}uky.edu).

Steers (379 ± 10 kg) with ruminal, duodenal, and ileal cannulas were used in a 5 x 5 Latin square digestion trial to quantify and evaluate the relationship between intestinal protein supply and intestinal starch disappearance. Treatments were infusions of 0, 50, 100, 150, or 200 g/d of casein along with 1,042 g/d of raw cornstarch. Abomasal infusions were accomplished by passing tubing and a pliable retaining washer through the reticular-omasal orifice into the abomasum. Steers were fed a 93% corn silage, 7% supplement diet that contained 12% crude protein at 1.65% body weight in 12 equal portions/d. Periods lasted 17 d (12 d for adaptation, 2 d of collections, and 3 d of rest). The quantity and percentage of organic matter and protein disappearance from the small intestine increased linearly (P < 0.03) with infused casein. Greater quantities of starch disappeared with increased casein infusion (P < 0.01). The infusion of 200 g/d of casein increased small intestinal starch disappearance by 226 g/d over the control. Casein infusion did not affect the quantity or percent of organic matter, starch, or protein disappearance in the large intestine. Treatments did not change ruminal ammonia N, ruminal pH, or plasma glucose concentrations. Starch disappearance from the small intestine was increased with greater protein flow to the duodenum of steers.

Key Words: Beef Cattle • Intestines • Protein Digestion • Ruminants • Starch Digestion • Steers

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