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Effect of zeranol implantation and dietary protein level on growth and blood hormones and metabolites of bulls

Published online by Cambridge University Press:  22 November 2017

H. Galbraith ,
G.F.M. Paterson ,
G.D. Henderson  and
E.A. Hunter
H. Galbraith
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
G.F.M. Paterson
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
G.D. Henderson
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
E.A. Hunter
Affiliation:
ARC Unit of Statistics, University of Edinburgh, Kings Buildings, Mayfield Road, Edinburgh EH1 3JZ
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Extract

Recent reports have suggested that growth in entire male cattle (bulls) may be increased by implantation with the growth promoter zeranol. It is well known that given similar nutrition bulls grow faster than castrate male cattle (steers). This effect may be attributed to the presence of testicular steroids in bulls which stimulate lean tissue deposition and hence greater live-weight gain. A major objective of this study was to provide further information on the effects of zeranol implantation on growth and blood concentrations of endogenous hormones and metabolites. Effects on concentrations of the endogenous steroids, testosterone and oestradiol-17β were of particular interest.

Type
Beef Production and Growth Promoters
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1984 , March 1984 , pp. 93
Copyright
Copyright © The British Society of Animal Production 1988

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References

Schanbacher, B.D. et al (1983). Animal Production, 37: 73–80.Google Scholar