DeHaan K C, Berger L L, Kesler D J, McKeith F K, Thomas D L
Dept. of Anim. Sci., University of Illinois, Urbana 61801.
J Anim Sci. 1990 Oct;68(10):3041-5. doi: 10.2527/1990.68103041x.
Forty-three pregnant Dorset and Dorset crossbred ewes were assigned randomly to a control group or implanted with either 300 mg trenbolone acetate (Low TBA) or 1,200 mg trenbolone acetate (High TBA) between d 40 and 60 of gestation. Adjusted weaning weights for ewe lambs were 23.3% less (P less than .10) with vs without TBA treatments. Postweaning ADG of ewe lambs was lower (P less than .05) but ADG of ram lambs was greater (P less than .05) for high TBA vs low TBA. Ewe lambs receiving high TBA had 19% less (P less than .05) gain per unit of feed than those receiving low TBA. Days on test for ewe lambs was greater (P less than .05) due to TBA treatment and for high TBA vs low TBA. Days on test for ram lambs was decreased (P less than .05) due to high TBA compared to low TBA. Subcutaneous fat over the ribeye and lower rib were greater (P less than .05) for high-TBA ewe lambs vs low-TBA ewe lambs. Percentage kidney and pelvic fat of ewe lambs was lower (P less than .05) due to TBA treatments. Ribeye area per unit of carcass weight was lower (P less than .05) in high-TBA ewe lambs vs low-TBA ewe lambs. Yield grade of ewe lambs was lower (P less than .05) for low TBA vs high TBA. Prenatal trenbolone acetate treatment of ewe lambs did not improve their subsequent postnatal growth performance and carcass traits. In addition, TBA implantation of the pregnant ewe produced dystocia and less milk production, as evidenced by the need for more lambs to be grafted.
43只怀孕的多塞特母羊和多塞特杂交母羊在妊娠第40至60天被随机分配到对照组，或植入300毫克醋酸群勃龙（低剂量醋酸群勃龙）或1200毫克醋酸群勃龙（高剂量醋酸群勃龙）。与未接受醋酸群勃龙处理的母羊羔羊相比，经调整后的断奶体重低23.3%（P<0.10）。高剂量醋酸群勃龙处理的母羊羔羊断奶后平均日增重较低（P<0.05），但公羊羔羊的平均日增重较高（P<0.05）。接受高剂量醋酸群勃龙处理的母羊羔羊每单位饲料的增重比接受低剂量醋酸群勃龙处理的母羊羔羊少19%（P<0.05）。由于醋酸群勃龙处理以及高剂量与低剂量醋酸群勃龙的差异，母羊羔羊的试验天数增加（P<0.05）。与低剂量醋酸群勃龙相比，高剂量醋酸群勃龙使公羊羔羊试验天数减少（P<0.05）。高剂量醋酸群勃龙处理的母羊羔羊肋骨眼和下肋骨处的皮下脂肪比低剂量醋酸群勃龙处理的母羊羔羊多（P<0.05）。由于醋酸群勃龙处理，母羊羔羊的肾周和盆腔脂肪百分比降低（P<0.05）。高剂量醋酸群勃龙处理的母羊羔羊每单位胴体重的肋骨眼面积较低（P<小于0.05）。低剂量醋酸群勃龙处理的母羊羔羊的产肉等级低于高剂量醋酸群勃龙处理的母羊羔羊（P<0.05）。产前对母羊羔羊进行醋酸群勃龙处理并不能改善其随后的产后生长性能和胴体性状。此外，对怀孕母羊植入醋酸群勃龙会导致难产和产奶量减少，更多羔羊需要寄养就证明了这一点。
