J. Anim Sci.
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J. Anim Sci. 1981. 53:1565-1573.
© 1981 American Society of Animal Science
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Effects of Monensin on site and Extent of Whole Corn Digestion and Bacterial Protein Synthesis in Beef Steers1,2,

Russell B. Muntifering3, Brent Theurer and T. H. Noon

University of Arizona, Tucson 85721

Abstract

Monensin was fed at 0 and 33 ppm in a crossover trial designed to determine the effect of this compound on ruminal and post-ruminal utilization of a corn-based diet and bacterial protein synthesis in abomasally fistulated steers. Monensin decreased (P<.10) ruminal true digestion of organic matter (OMc, corrected for bacterial cell synthesis) and apparent ruminal digestion of starch by 19%, but had no effect on apparent total tract digestion of OM or starch. Apparent ruminal and total tract digestibilities of crude protein (CP) were unchanged. Monensin decreased (P<.07) the contribution of bacterial N to total abomasal N (52 vs 58%), and increased (P<.06) the contribution of ruminally undegraded feed N (46 vs 40%), but had no effect on total N or amino acids recovered from the abomasum. Efficiency of bacterial protein synthesis (grams bacterial CP/100 g ruminally digested OMc) was unchanged. Monensin decreased (P<.05) the fraction of bacterial N to total N digested postruminally (42 vs 50%) and increased (P< .05) the contribution of ruminally undegraded feed N digested postruminally (58 vs 50%). Monensin caused a greater proportion of feed N and starch to be digested in the intestines than in the rumen (with possibly greater resultant metabolic efficiency), and this may account for some of the benefits obtained from feeding this compound with high grain diets.

Footnotes

1 Arizona Agr. Exp. Sta. Journal Article 3330. Appreciative acknowledgement is extended to Mr. A. J. Longo for assistance in the amino acid analyses.

2 This paper is part of a dissertation prepared by the senior author in partial fulfillment of the requirements for the Ph.D. degree in Agr. Biochem. and Nutr.

3 Present address: Dept. of Anim. Sci., Univ. of Kentucky, Lexington 40546.






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Copyright © 1981 by the American Society of Animal Science.