J. Anim Sci.
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J. Anim Sci. 1988. 66:792-797.
© 1988 American Society of Animal Science
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Effects of Salinomycin on Ruminal Characteristics and Performance of Grazing Beef Steers1

C. P. Bagley2, J. I. Feazel2, D. G. Morrison2 and D. M. Lucas3

Louisiana State University Agricultural Center,4, Baton Rouge 70893

Abstract

Grazing trials were conducted for 2 yr using weanling Brahman crossbred beef steers to evaluate graded levels of salinomycin (0, 50, 100 or 150 mg · head –6 · d–1) for 161 d and to evaluate salinomycin in a free-choice mineral supplement (99 d). The 40 and 48 steers in trials 1 and 2 had average initial weights of 198 and 285 kg, respectively. In trial 1, steers were group-fed to consume either 0, 50, 100 or 150 mg of salinomycin · head–1 · d–1 in .9 kg ground corn while grazing bermudagrass pastures. Both linear (P < .01) and quadratic (P < .05) effects were observed for steer performance as salinomycin level increased from 0 to 150 mg · head–1 · d–1. Linear increases (P < .01) in ruminal NH3-N (mg/100 ml) and in the molar proportion of propionate and decreases (P < .01) in butyrate and acetate/propionate were detected. In trial 2, mineral supplements with and without salinomycin were fed free-choice to steers on bermudagrass pasture. The mean salinomycin intake of 38 mg · head–1 · d–1 was lower than anticipated as a result of the instability of salinomycin in the mineral supplement and the slightly lower intake (65 g/d) than anticipated (75 g/d). Performance of steers was not influenced by salinomycin supplementation in trial 2. The ionophore salinomycin at intakes over 50 mg · head–1 · d–1 appears to increase the performance of steers grazing bermudagrass pasture.

Footnotes

1 The research reported herein was supported in part by a grant from A. H. Robins Co., Richmond, VA.

2 Rosepine Res. Sta., Rosepine 70659; to whom requests for reprints should be addressed.

3 Manager, Ruminant Field Res. Section, A. H. Robins Co., Richmond, VA.

4 Published with approval of the Louisiana Agric. Exp. Sta. as manuscript number 87-92-1302.






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Copyright © 1988 by the American Society of Animal Science.