Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T18:57:43.520Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  02 September 2010

C. Shorrock ,
B. S. Capper ,
D. Light  and
M. M. J. Mlambo
C. Shorrock
Affiliation:
Animal Production Research Unit, Private Bag 0033, Gaborone, Botswana
B. S. Capper
Affiliation:
Animal Production Research Unit, Private Bag 0033, Gaborone, Botswana
D. Light
Affiliation:
Animal Production Research Unit, Private Bag 0033, Gaborone, Botswana
M. M. J. Mlambo
Affiliation:
Animal Production Research Unit, Private Bag 0033, Gaborone, Botswana
Get access

Abstract

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.

Type
Research Article
Information
Animal Production , Volume 26 , Issue 2 , April 1978 , pp. 221 - 224
Copyright
Copyright © British Society of Animal Science 1978

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

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: 235–239.CrossRefGoogle ScholarPubMed
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: 275–276 (Abstr.).Google Scholar
Fontenot, J. P., Kelly, R. F. and Webb, K. E. 1973. Zeranol implants in grazing and fattening steers. J. Anim. Sci. 36: 217 (Abstr.).Google Scholar
Harvey, W. R. 1960. Least squares analysis of data with unequal sub-class numbers. United States Department of Agriculture, ARS–20–8 (Mimeograph).Google Scholar
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: 1–6.CrossRefGoogle ScholarPubMed
Sharp, G. D. and Dyer, I. A. 1972. Zearalanol metabolism in steers. J. Anim. Sci. 34: 176–179.CrossRefGoogle ScholarPubMed