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Influence of Roughage Level on the Site and Extent of Digestion of Whole Shelled Corn by Beef Steers¹

Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

Whole shelled corn rations containing 0, 7, 14 and 21% roughage in the form of cottonseed hulls (rations 0, 7, 14 and 21, respectively) were fed to four steers fitted with ruminal and abomasal cannulae in a 4 x 4 latin square design. Steers were fed hourly, using automatic feeders, to obtain steady state conditions in the digestive tract. Total, ruminal and intestinal starch digestion coefficients for rations 0, 7, 14 and 21 were 96.4, 80.0, 81.8; 94.7, 67.9, 83.6; 92.2, 71.5, 72.9; and 95.4, 72.1, 83.8, respectively. Total DM digestion coefficients were 84.3, 78.4, 71.8 and 749, respectively. Cellulose digestion was almost totally confined to the rumen on all rations. Total digestion coefficients for starch, DM and cellulose tended to be lowest for ration 14, apparently due to a decrease in the digestion of the concentrate portion of the ration caused by an increased rate of passage through the digestive tract.

¹ Journal Article 3001 of the Agricultural Experiment Station, Oklahoma State University, Stillwater. This research was conducted by the Department of Animal Sciences and Industry.

² Present address: U.S.D.A. Southwestern Great Plains Research Center, Bushland, Texas 79012.

³ Present address: Department of Animal Science, University of Tennessee, Knoxville 37900.

⁴ Department of Animal Sciences and Industry, Oklahoma State University, Stillwater 74074

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