O'Lamhna M, Roche J F
Vet Rec. 1983 Dec 3;113(23):531-4.
The effects of implantation with different anabolic agents on growth rate, behaviour, carcase parameters and testicular size of bulls were evaluated in an experiment with 361 Friesian bulls about three months old on three farms. Animals were allocated to one of the following treatments: (a) Control; (b) repeated implantation with 36 mg zeranol at intervals of 95 to 124 days; (c) repeated implantation with 20 mg oestradiol benzoate plus 140 mg trenbolone acetate as in (b); (d) repeated implantation with 20 mg oestradiol benzoate plus 200 mg progesterone as in (b); (e) implanted once with 45 mg oestradiol-17 beta. Daily liveweight gain, carcase weight, testicular size and behaviour of the animals were the parameters measured. Repeated implantation of young bulls with hormones, beginning at eight to 10 weeks old, increases liveweight gain and carcase weight from 0 to 15 per cent, reduces aggressive behaviour and testicular size and, in some instances, improves conformation and increases fat cover of the carcase.
在三个农场对361头约三个月大的弗里斯兰公牛进行的一项实验中，评估了植入不同合成代谢剂对公牛生长速度、行为、胴体参数和睾丸大小的影响。动物被分配到以下处理组之一：(a) 对照组；(b) 每隔95至124天重复植入36毫克玉米赤霉醇；(c) 如(b)组一样，重复植入20毫克苯甲酸雌二醇加140毫克醋酸群勃龙；(d) 如(b)组一样，重复植入20毫克苯甲酸雌二醇加200毫克孕酮；(e) 一次性植入45毫克17-β雌二醇。测量的参数包括动物的日增重、胴体重、睾丸大小和行为。从8至10周龄开始对年轻公牛重复植入激素，可使体重增加和胴体重增加0至15%，减少攻击行为和睾丸大小，并且在某些情况下，改善胴体外形并增加胴体脂肪覆盖度。
