Rumsey T S, Kozak A S, Tyrrell H F
Growth. 1985 Autumn;49(3):354-66.
The effects of diethylstilbestrol (DES) and Synovex-S hormonal growth promotants on composition of body ash deposited by feedlot beef steers were studied in two slaughter-balance trials. Trial 1 consisted of three groups of eight Hereford steers averaging 225 kg initial body weight. One group was initially slaughtered (IS) at the beginning of the trial and two groups, control (C) and DES-treated (20 mg/steer daily in diet), were fed for 177 d and then slaughtered. Trial 2 consisted of 28 Hereford steers averaging 310 kg initial body weight. Four steers were IS and 24 steers were assigned to a factorial arrangement of treatments (- or + Synovex-S ear implant and - or + dietary kiln dust), fed for 126 d and slaughtered. Each Synovex-S ear implant contained 200 mg progesterone and 20 mg estradiol benzoate. Kiln dust (KD) was fed as a digestive tract buffer, and the +KD diets contained 1.23% Ca and .37% P compared with .45% Ca and .36% P in -KD diets on an as-fed basis. Mineral concentration in body tissue was greater for IS than for fed steers reflecting deposition of soft tissue, particularly fat, during the feeding period. Mineral concentration in body tissue was similar between C and hormonally-treated steers. Mineral composition of tissue ash in IS, C and hormonally-treated steers and composition of ash deposited during the feeding period for C and treated steers were similar. The results suggest that both DES and Synovex treatments of beef steers do not cause an increased propensity for skeletal growth but that ash deposition is of similar composition in C and treated steers.
在两项屠宰平衡试验中，研究了己烯雌酚（DES）和孕马血清促性腺激素（Synovex-S）这两种激素生长促进剂对饲养场育肥牛沉积体灰成分的影响。试验1包括三组，每组8头赫里福德阉牛，初始体重平均为225千克。一组在试验开始时即进行初始屠宰（IS），另外两组，即对照组（C）和DES处理组（日粮中每头每天添加20毫克），饲养177天然后屠宰。试验2包括28头赫里福德阉牛，初始体重平均为310千克。4头阉牛进行初始屠宰，24头阉牛被分配到析因处理组（-或+ Synovex-S耳部植入剂以及-或+日粮窑灰），饲养126天然后屠宰。每枚Synovex-S耳部植入剂含有200毫克孕酮和20毫克苯甲酸雌二醇。窑灰（KD）作为消化道缓冲剂投喂，与不添加KD的日粮相比，添加KD的日粮在饲喂基础上钙含量为1.23%、磷含量为0.37%，而不添加KD的日粮钙含量为0.45%、磷含量为0.36%。初始屠宰的阉牛体组织中的矿物质浓度高于饲养阉牛，这反映了饲养期间软组织尤其是脂肪的沉积情况。对照组和激素处理组阉牛体组织中的矿物质浓度相似。初始屠宰、对照组和激素处理组阉牛的组织灰分矿物质组成以及对照组和处理组阉牛在饲养期间沉积的灰分组成相似。结果表明，DES和Synovex对育肥牛的处理均不会导致骨骼生长倾向增加，但对照组和处理组阉牛的灰分沉积组成相似。
