J. Anim Sci.
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J. Anim Sci. 1979. 48:1338-1342.
© 1979 American Society of Animal Science
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Effect of Avoparcin and Monensin on Feedlot Performance of Beef Cattle1 ,2,

R. J. Johnson3, M. L. Herlugson, L. Bola Ojikutu, Gustavo Cordova, I. A. Dyer4, Paul Zimmer5 and Roger DeLay6

Washington State University,7, Pullman 99164

Abstract

One hundred and fifty yearling steers weighing an average of 273 ± 23 kg were fed for 112 days to evaluate the effect of 0, 16.5, 33 and 66 ppm avoparcin and 3 3 ppm monensin in the feed on growth rate, feed efficiency, carcass quality and the concentration of volatile fatty acid (VFA) in the rumen. The steers were allotted to 25 pens with six head per pen in a randomized complete block design of five treatments and five replicates per treatment. Rumen samples were obtained from a randomly selected group of steers from each treatment at the end of the trial for VFA determination. Carcass grade, carcass weight and dressing percentage were determined at slaughter. Avoparcin at all levels improved feed efficiency and produced daily gains that were greater than untreated control or monensin treated steers. Ruminal propionate increased due to avoparcin ingestion. Neither avoparcin nor monensin had an effect (P> .05) on measured carcass parameters.

Footnotes

1 Scientific Paper No. 5190. College of Agriculture Research Center, Washington State University. Project 0413.

2 Appreciation is expressed to American Cyanamid Co. for cattle, feed, and partial support of this study.

3 Present address: Head, Southeast Kansas Branch Experimental Station, Mound Valley 67354.

4 Present address: Dean, College of Agriculture, Texas A&I University, Kingsville 78363.

5 American Cyanamid Co., 10600 W. 53rd St., Shawnee Mission, KS 66203.

6 American Cyanamid Co., Agricultural Division, P. O. Box 400, Princeton, NJ 08540.

7 Department of Animal Sciences.






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Copyright © 1979 by the American Society of Animal Science.