去势对青年新疆褐牛日增重、体尺指标及血清生化指标的影响

试验旨在研究去势对青年新疆褐牛不同时期日增重、体尺指标及血清生化指标的影响。选取21月龄的青年新疆褐牛62头，分为试验组（去势）和对照组（未去势），试验动物分别于22、23、24、25和26月龄进行体重及体尺指标测定，并采集血样。预试期10 d，正试期150 d。结果表明，对照组日增重在23、24月龄时显著高于试验组（P<0.05），在25、26月龄时极显著高于试验组（P<0.01）；对照组全期平均日增重较试验组显著提高13.40%（P<0.05）。对照组体高在24、25、26月龄时显著高于试验组（P<0.05）；对照组体斜长、体直长、胸围在23、24、25、26月龄时显著高于试验组（P<0.05）；试验组尻长和坐骨宽在23、24、25、26月龄时显著高于对照组（P<0.05）。试验组血清尿素氮和白蛋白含量在23、24、25、26月龄时显著高于对照组（P<0.05），而血清球蛋白含量则呈相反趋势；对照组血清谷丙转氨酶、谷草转氨酶活性在24、25、26月龄时显著高于试验组（P<0.05）。综上所述，去势降低了青年新疆褐牛的日增重、生长速度和蛋白质代谢能力，但提高了青年新疆褐牛沉积脂肪的能力。

Effect of Castration on Daily Gain,Body Measurement Index and Serum Biochemical Indices of Young Xinjiang Brown Cattle

The experiment was conducted to study the effect of castration on weight,body measurement index and serum biochemical indices of young Xinjiang brown cattle in different periods.62 Xinjiang brown cattle (21-months-old) were chosen and divided into the experimental group (castrated) and control group (non castrated).Experimental animals were measured weight and body measurement index and detected blood samples in 22,23,24,25 and 26 months.The pre-test period lasted for 10 days and the trial period lasted for 150 days,The results showed that the daily gain of control group was significantly higher than that of experimental group in 23 and 24 months (P<0.05).The daily gain of control group was highly significantly higher than that of experimental group in 25 and 26 months (P<0.01).The whole daily gain of control group,which was significantly increased by 13.40% than that of experimental group (P<0.05).The body height of control group was significantly higher than that of experimental group in 24,25 and 26 months (P<0.05).The body length,long body straight and chest circumference of control group were significantly higher than that of experimental group in 23,24,25 and 26 months (P<0.05).The tajiri long and sciatic wide of experimental group were significantly higher than that of control group in 23,24,25 and 26 months (P<0.05).The serum levels of urea nitrogen and albumin of experimental group were significantly higher than that of control group in 23,24,25 and 26 months (P<0.05),while the serum level of globulin was opposite trend.The serum activities of alanine aminotransferase and aspertate aminotransferase of control group were significantly higher than that of experimental group in 24,25 and 26 months (P<0.05).In conclusion,castration could reduced daily gain,growth rate and protein metabolism capacity of young Xinjiang brown cattle,but that could improved the ability of fat deposition.