J. Anim Sci.
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J. Anim Sci. 1972. 35:128-132.
© 1972 American Society of Animal Science
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Effects of Zeranol, Dietary Protein Level and Methionine Hydroxy Analog on Growth and Carcass Characters and Certain Blood Metabolites in Lambs1

L. L. Wilson, M. L. Borger, A. D. Peterson, M. C. Rugh and C. F. Orley2

The Pennsylvania State University, University Park 16802

Abstract

Eighty-Four wethers were allotted to a 3 x 2 x 2 factorial of three protein levels (9.5, 11.0 or 12.5%) and 0 or 12 mg zeranol implants and 0 or 1 g/head/day of methionine hydroxy analog (MHA) added to the rations. The study was 78 days in length with blood serum samples collected on the 33rd and 35th days after a 2-hr, feed and water deprivation. Zeranol altered rate and efficiency (gain/megacalorie of calculated DE) of gain in the first 39 days by 12.2 and 9.9%, respectively, and 2.3 and –3.4% during the last 39 days. Although the gain responses to zeranol were 9.3, 7.1 and 4.7% within the 9.5, 11.0 and 12.5% protein diets, none of the two-way interactions was significant for growth, carcass or blood characters. The 9.5% protein diet depressed gain (P<.01) only in the last half of the trial. Addition of MHA did not significantly affect gain, but decreased feed consumption by 6.7% and increased efficiency by 7.3% over the entire trial. Carcass composition was not affected by any of the treatments. Zeranol (P<.01), low dietary protein content, and MHA (P<.05) depressed serum FFA levels, and protein level was directly related to serum urea-N.

Footnotes

1 Journal Series of the Pennsylvania Agricultural Experiment Station, Paper No. 4079; number assigned October 15, 1971.

2 The authors are grateful to Commercial Solvents Corporation, Terre Haute, Indiana for providing partial support of this study and to East Carson Packing Co., Pittsburgh, for cooperation in collecting carcass data.






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Copyright © 1972 by the American Society of Animal Science.