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Influence of Roughage Level and Corn Processing Method on Microbial Protein Synthesis by Beef Steers¹

Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

Two trials were conducted to determine the influence of roughage level and corn processing method on the efficiency of nitrogen (N) utilization by beef steers fed high concentrate rations. In trial 1, abomasally cannulated steers were fed rations containing whole shelled corn (WSC) with cottonseed hull (CSH) levels of 0, 7, 14 and 21% and in trial 2, rations contained steam flaked (SF) and dry rolled (DR) corn with 0 and 21% CSH levels. Lignin was used as a marker for determination of digesta passage through the abomasum. In trial 1, the grams of microbial protein synthesized per 100 g dry matter fermented in the rumen (MP/DDM) were 7.5, 10.3, 11.8 and 12.7 for rations 0, 7, 14 and 21, respectively. More of the N intake bypassed the rumen undegraded (BPN) on rations 14 and 21 resulting in more (P<.05) total protein reaching the intestine (AP). In trial 2, MP/DDM for main effects, SF, DR, 0 and 21 were 7.0, 10.5, 6.3 and 11.2, respectively. N was absorbed from the rumen on all rations, but the N loss was less (P<.01) on the 21% CSH rations. BPN and AP were higher (P<.05) on the 21% roughage rations and tended to be higher for DR than SF corn.

¹ Journal Article 3044 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.

⁵ Present address: Department of Animal Science, University of Southern Illinois, Carbondale 62901.

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