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

Grantley Smith, M.; Southgate, J.R.; Jones, D.W.; Peters, A.R.; Dobson, M.

British Society of Animal Production Winter Meeting, 17-19 March 1986, Grand Hotel, Scarborough (Paper 92): 2


Accession: 001483344

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In trials on 14 farms, 450 bulls (mostly British Friesians) were paired for body weight at 3-4 months of age, and one member of each pair was given an implant of 45 mg oestradiol-17 beta (Compudose). Carcass studies were carried out on 96 bulls. Results are tabulated. In the first 3 months after implantation, growth rate was greater than in non-implanted controls (1528 vs. 1452 g). After this period, there was no additional live weight gain due to implantation. Implanted bulls had a higher "killing out" than controls (539 vs. 532 g/kg), and a higher carcass weight by 4.6 kg. Carcasses of implanted bulls were fatter by 9 g/kg side weight than those of controls, and carcass shape was better in implanted bulls. The intermuscular and intermuscular fat contents, and meat colour, were not affected by implantation.