Rumsey T S, Tyrrell H F, Dinius D A, Moe P W, Cross H R
J Anim Sci. 1981 Sep;53(3):589-600. doi: 10.2527/jas1981.533589x.
The effect of diethylstilbestrol (DES) on the composition of tissue gain of Hereford steers was studied in a complete slaughter balance trial. Eight steers were slaughtered initially (IS) and, after 177 days on feed, eight control steers (C) and seven steers that had been fed 20 mg DES daily (DES) were slaughtered. Initial full body weight averaged 224.8 kg, and final full body weight averaged 403.0 kg for the C steers and 433.6 kg for the DES steers. Final empty body weight averaged 346.6 kg for the C steers and 368.0 kg for the DES steers. DES improved live weight gain by 17% and conversion of feed dry matter to live weight by 12%. Recovery of wet weight during slaughter averaged 99.6%. DES steers had larger rib cut weights and greater proportions of separable lean and bone plus connective tissue in the rib cuts than C steers, an ribeye area tended to be larger in DES steers. DES caused a small shift in relative body composition toward more protein, moisture and ash. Tissue gain in DES steers consisted of 28.3% more protein, 26.0% more moisture, 73.2% more ash, 1.5% less fat and 109.1% more residual (dry matter not accounted for by N x 6.25, ether extract and ash) than did tissue gain in C steers. Energy gain per unit of energy intake over the feeding period was not affected by DES treatment, but DES improved protein gain per unit of protein intake and per unit of energy intake by approximately 20% within the total empty body and by about 25% within the carcass fraction. Results confirm indirect estimates in the literature indicating that DES increases skeletal growth and lean tissue deposition in feedlot steers.
在一项完整的屠宰平衡试验中，研究了己烯雌酚（DES）对赫里福德阉牛组织增重组成的影响。最初屠宰了8头阉牛（初始屠宰，IS），在育肥177天后，屠宰了8头对照阉牛（C）和7头每天饲喂20毫克DES的阉牛（DES）。C组阉牛初始全身体重平均为224.8千克，最终全身体重平均为403.0千克，DES组阉牛为433.6千克。C组阉牛最终空体重平均为346.6千克，DES组阉牛为368.0千克。DES使活体重增加了17%，饲料干物质转化为活体重的效率提高了12%。屠宰期间湿重回收率平均为99.6%。DES组阉牛的肋部切块重量更大，肋部切块中可分离瘦肉、骨头和结缔组织的比例高于C组阉牛，并且DES组阉牛的眼肌面积往往更大。DES导致相对身体组成向更多的蛋白质、水分和灰分有小幅转变。与C组阉牛相比，DES组阉牛的组织增重中蛋白质多28.3%、水分多26.0%、灰分多73.2%、脂肪少1.5%、残余物（氮×6.25、乙醚提取物和灰分未占的干物质）多109.1%。在饲喂期内，每单位能量摄入量的能量增重不受DES处理的影响，但DES使每单位蛋白质摄入量和每单位能量摄入量的蛋白质增重在整个空体中提高了约20%，在胴体部分提高了约25%。结果证实了文献中的间接估计，表明DES可增加育肥牛的骨骼生长和瘦肉组织沉积。
