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A note on the performance of fattening steers implanted with zeranol under grazing and feedlot conditions in Botswana

  • C. Shorrock (a1), B. S. Capper (a1), D. Light (a1) and M. M. J. Mlambo (a1)

Trials involving a total of 401 steers were carried out from 1974 to 1976 to determine the effect of implantation with zeranol on the performance of fattening steers under grazing and feedlot conditions i n Botswana.

Over a 180-day grazing period in 1974, 1975 and 1976 there was a significant improvement in live-weight gain of 11·9, 24·5 and 12·3% i n implanted steers over control steers. Under feedlot conditions there was a mean improvement in live-weight gain of implanted steers over control steers of 17·9% over an average stay in the feedlot of 95 days.

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Bennett, G., Beaumont, W. H. and Brown, P. R. M. 1974. Use of the anabolic agent zearanol (resorcylic acid lactone) as a growth promoter for cattle. Vet. Rec. 94: 235239.
Borger, M. L., Wilson, L. L., Sink, J. D., Ziegler, J. H., Davis, S. L., Orley, C. F. and Rugh, M. C. 1971. Zeranol and protein effects on finishing steers. J. Arum. Sci. 33: 275276 (Abstr.).
Fontenot, J. P., Kelly, R. F. and Webb, K. E. 1973. Zeranol implants in grazing and fattening steers. J. Anim. Sci. 36: 217 (Abstr.).
Harvey, W. R. 1960. Least squares analysis of data with unequal sub-class numbers. United States Department of Agriculture, ARS–20–8 (Mimeograph).
Rennie, T., Light, D., Rutherford, A., Miller, M., Fisher, I., Pratchett, D., Capper, B., Buck, N. and Trail, J. 1977. Beef cattle productivity under traditional and improved management in Botswana. Trop. Anim. Hlth Prod. 9: 16.
Sharp, G. D. and Dyer, I. A. 1972. Zearalanol metabolism in steers. J. Anim. Sci. 34: 176179.
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Animal Science
  • ISSN: 1357-7298
  • EISSN: 1748-748X
  • URL: /core/journals/animal-science
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