宁夏地区育肥后期肉羊日粮中添加膨化尿素应用研究

Application of sheep fattening added extruded urea in Ningxia region

研究旨在探讨宁夏地区育肥后期肉羊日粮中膨化尿素的适宜添加量。采用完全随机单位组设计方法,选择体重(23.18±1.63)kg、年龄及生理状态相近的滩寒杂交肉羊40只,根据膨化尿素添加量的不同随机分为4组:A1、A2、A3、A4组,饲养管理条件一致,试验期85 d。结果显示:1随着日粮尿素添加量的增大,各试验组氮的表观消化率有下降的趋势,A3组氮的表观消化率最高;2随着日粮尿素添加量的增大,试验羊的生长速度有增加的趋势,在试验末期A3、A4组活体重量显著高于A1组(P<0.05),A3组累计增重、平均日增重显著高于A1组;3随着日粮尿素添加量的增大,试验肉羊SUN有增大的趋势,各试验组间表现出了极显著的差异(P<0.01)。研究表明:育肥后期肉羊日粮中添加膨化尿素14 g/d,相对于其他试验组,能显著增加肉羊的日增重,提高饲料中氮的利用率。

The present study was conducted to explore the optimum adding amount of puffing urea in fattening sheep diets. 40 Tan×Han crossbred sheeps were randonmly allotted to one of four dietary treatments based on body weight(23.18 ± 1.63)kg, age and physiological status. The treatments were included A1,A2, A3, and A4, which according to the puffing urea added amount. The experiment lasted 85 d. The results showed that the nitrogen apparent digestibility expressed a decreased tendency as puffing urea increased.The apparent digestibility of nitrogen for sheep in treatment A3 was the highest. The average daily gain increased as puffing urea concentration increased in dietary. The average daily gain for sheep in treatment A3 was significantly higher in treatment A1(P<0.05). As the increment of dietary puffing urea concentration,the serum urea nitrogen has an increased tendency. There was an extremely significant difference among treatments(P<0.01). In conclusion, fattening sheep diets contain a concentration of 14 g/d puffing urea could significantly increase average daily gain and improve the feed nitrogen utilization.