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Effects of level and diurnal variation of dietary concentrate on digestion and passage rate in beef steers
Authors:A.L. Goetsch  F.N. Owens
Affiliation:Animal Science Department, Oklahoma State University, Stillwater, OK 74078 U.S.A.
Abstract:Effects of dietary concentrate level and varying the level of concentrate diurnally on site of digestion and passage rate with high concentrate diets were determined with four mature beef steers. Increasing concentrate level from 65 to 80 and 95% decreased ruminal, duodenal and fecal pH, ruminal dilution rates for fluids and particulates and tended to reduce digestion of acid detergent fiber, especially post-ruminally. Ruminal escape of dietary protein tended to increase with concentrate level although microbial efficiency tended to decrease. Compared with an 80% concentrate diet, feeding 95% concentrate in the morning and 65% concentrate in the evening tended to increase ruminal digestion of acid detergent fiber and starch.
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