Seasonal growth and carcass characteristics of grazing steers implanted with trenbolone acetate and oestradiol

摘要: Summary. Measurements were made of the effects Revalor on seasonal growth, carcass weight and fatness Zebu crossbred steers in central Queensland. Ninety-three grazed improved pastures for 15 months prior to slaughter. Half animals implanted with (140 mg trenbolone acetate plus 28 oestradiol-17B mixed cholesterol) first 25 weeks (September-March) balance left as controls. During this period, treated gained significantly (P<0.001) faster than untreated (0.57 v. 0.42 kglday). In March, 2 groups further divided into subgroups 1 subgroup from each group was either time or reimplanted Revalor. The March again 4 later. other not implanted. After implantation (1.27 kgjday) all treatment groups. Steers at beginning experiment September, but continued gain (P<0.05) period March-May which had never been (1.01 0.85 This suggests that implant still having an anabolic action least 6 after implantation. ended slaughter December. Animals some during heavier (about 22 kg) carcasses 13 those untreated. throughout 9 before less subcutaneous fat P8 rumv site earlier