Effect of oestradiol 17 beta and zeranol at turnout and yarding with and without trenbolone at yarding on liveweight gain and carcase composition in 18 month beef steers

Southgate, J.R.; Peters, A.R.; Grantley Smith, M.; Jones, D.W.; Dixon, S.N.; Mallinson, C.B.

British Society of Animal Production Winter Meeting, 17-19 March 1986, Grand Hotel, Scarborough (Paper 93): 2

1986


Accession: 001347188

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Abstract
In trials on 14 farms, 770 steers (mainly Friesians) were given the following 7 treatments: (1) no implantation; (2) Ralgro (zeranol ) + Finaplix (trenbolone) at yarding (3 months after turnout); (3) Compudose (oestradiol-17 beta ) + Finaplix at yarding; (4) Ralgro at turnout and yarding; (5) Ralgro at turnout and Ralgro + Finaplix at yarding; (6) Compudose at turnout; (7) Compudose at turnout and Finaplix at yarding. Data are tabulated on growth, and on carcass characters for some of the steers. In the 7 groups resp., overall daily gain averaged 873, 952, 969, 971, 993, 991 and 968 g (P<0.05). For groups 1, 4, 5, 6 and 7, carcass conformation score (15-point scale) averaged 4.9, 5.4, 5.4, 5.7 and 5.2, and estimated subcutaneous fat 75, 84, 80, 84 and 83 g/kg (group 1 vs. other groups, P<0.05).