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The effects on daily gain and carcases of implants containing testosterone and oestradiol on heifers and implants containing zeranol on intensive cereal bulls

Published online by Cambridge University Press:  21 November 2017

J R Southgate ,
A R Peters ,
S Dean  and
J Everett
J R Southgate
Affiliation:
Meat and Livestock Commission, PO Box 44, Bletchley, MX2 2EF
A R Peters
Affiliation:
Meat and Livestock Commission, PO Box 44, Bletchley, MX2 2EF
S Dean
Affiliation:
Syntex Pharmaceuticals Ltd, Maidenhead, Berkshire, SL6 1RD
J Everett
Affiliation:
Crown Chemicals Co Ltd, Lamberhurst, Kent, TN3 8DJ
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Extract

Trials were undertaken with 320 heifers in 13 groups on nine farms. Within each group heifers were allocated within matched weight pairs to treatment sub-groups at yarding. One sub-group was treated with an implant containing 200 mg Testosterone Propionate and 20 mg Oestradiol Benzoate (Synovex-H, Syntex). The two sub-groups were then reared together until slaughter or disbandonment of the group. Seven groups were sold deadweight, five of which had liveweights just prior to slaughter. Four farms sold to live auctions and weighed cattle on the day of sale. Two groups were grass finished but were weighed at turnout (Table 1).

Type
Beef Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1987 , March 1987 , pp. 119
Copyright
Copyright © The British Society of Animal Production 1987

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