J. Anim Sci.
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J. Anim Sci. 1988. 66:2736-2741.
© 1988 American Society of Animal Science
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Effect of Sequential Implanting with Zeranol on Steer Lifetime Performance1

D. D. Simms2, T. B. Goehring3, R. T. Brandt, Jr.2, G. L. Kuhl2, J. J. Higgins4, S. B. Laudert5 and R. W. Lee6

Kansas State University, Manhattan 66506

Abstract

Three trials involving 513 exotic crossbred steers were conducted to determine the effect of zeranol implanting in the suckling and growing phases on subsequent feedlot performance and carcass characteristics. Treatments were 1) unimplanted control, 0000; 2) implanted twice in the finishing phase, 00II; 3) implanted in the growing phase and twice in the finishing phase, 0III; 4) implanted in the suckling phase and twice in the finishing phase, I0II; 5) implanted in the suckling and growing phases with a single implant in the finishing phase, III0; and 6) implanted in the suckling and growing phases and twice in the finishing phase, IIII. Implanting in the suckling period did not significantly affect preweaning gain. Implanting in the growing period produced a treatment x trial interaction (P < .05), but zeranol increased gains by an average of 8.4% over the three trials. Growing period gain was not influenced by implanting during suckling. Implanting twice during the finishing period increased gain (P < .05) over unimplanted and III0 steers. Finishing gain was not influenced by previous suckling and(or) growing implant treatment. Lifetime ADG of steers was increased (p < .05) by all implant treatments compared with unimplanted controls. Zeranol tended (p = .14) to improve feed conversion in the finishing phase. All implant treatments increased hot carcass weight (p < .05), and all but III0 reduced fat deposition, as indicated by lower quality grade (p < .05). Other carcass characteristics were not significantly affected by treatment. These trials demonstrated that implanting in the suckling and(or) growing phases of production did not reduce performance in the finishing phase.

Footnotes

1 Contribution Number 88-201-J from the Kansas Agric. Exp. Sta. Appreciation is expressed to International Minerals and Chemical Co. for finiancial support of this study.

2 Dept. of Anim. Sci. and Ind.

3 American Angus Assoc., St. Joseph, MO.

4 Dept. of Statistics.

5 Southwest Area Extension Office, Garden City, KS.

6 Garden City, KS.






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Copyright © 1988 by the American Society of Animal Science.