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The effect of oestradiol 17β on liveweight gain and carcass composition of intensively reared cereal beef bulls

Published online by Cambridge University Press:  22 November 2017

M. P. Grantley-Smith ,
J. R. Southgate ,
D. W. Jones ,
A. R. Peters  and
M. Dobson
M. P. Grantley-Smith
Affiliation:
Meat Livestock Commission, P.O. Box 44, Queensway House, Bletchley, MK2 2EF
J. R. Southgate
Affiliation:
Meat Livestock Commission, P.O. Box 44, Queensway House, Bletchley, MK2 2EF
D. W. Jones
Affiliation:
Meat Livestock Commission, P.O. Box 44, Queensway House, Bletchley, MK2 2EF
A. R. Peters
Affiliation:
Meat Livestock Commission, P.O. Box 44, Queensway House, Bletchley, MK2 2EF
M. Dobson
Affiliation:
Elanco Products Ltd., Basingstoke, Hants
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Extract

Oestradiol 17β (Compudose-365 ) is widely used as a growth promoter in steers and the daily gain response is well known. However, for bull beef production the efficiency of the hormone implant is not so well researched, particularly in Great Britain, where there is not yet a product licence for use in bulls. Work in the U.S.A. has shown that Oestradiol 17β implants in bulls stimulate daily gain and improve carcass shape, but at the same time increasing subcutaneous fat levels (Johnson et al, 1984). The trial described here was designed to study the effect of Oestradiol 17β under a range of farm conditions in Great Britain.

Sixteen groups of bulls on 14 farms, totalling 450 bulls, were selected. Fourteen of the groups were wholly British Friesian, the remainder Friesian/Holstein or Limousin cross. The bulls were weighed at 3-4 months of age and paired by weight. One of each pair was implanted subcutaneously in the ear with a silastic rubber implant containing 45 mg Oestradiol 17β (Compudose-365, Elanco Products Ltd.). The bulls were weighed after three and six months (mean 108 and 180 days respectively), and about half were weighed within four days of slaughter (mean 222 days).

Type
Consumer Attitudes and Heat Composition
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1986 , March 1986 , pp. 92
Copyright
Copyright © The British Society of Animal Production 1986

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References

Johnson, D., Saveil, J., Smith, G., Gill, D., Williams, D., Walters, L. and Martin, J. 1384. J. Anim. Sci 58 : 920–925. Google Scholar