不同精料补饲水平对藏羊生长及效益的影响

Effects of Different Concentrate Supplementing Levels on the Growth and Benefits of Tibetan Sheep

[目的]为藏羊选择适宜的精料添加量。[方法]选用1岁左右、体重接近的藏绵羊30只,随机分为3组。以青干草为基础日粮,150、300、450 g/d 3种精料水平对各组藏羊进行补饲育肥,采用单因子分组设计,研究精料补饲水平对藏羊采食量、饲料转化效率及经济效益的影响。[结果]藏羊日采食量、日增重均随精料补饲水平的提高而增加,而对青干草的采食量略有下降趋势;不同精料补饲水平下,育肥后期藏羊日增重均呈下降趋势。精料和日粮转化效率随精料补饲量的提高呈二次曲线变化。精料和日粮转化效率、经济效益均以300 g/d精料处理组为最高。[结论]藏羊育肥时间以45～50 d为宜,精料添加量以300 g/（只.d）最好。

[Objective] The objective was to select the optimum concentrate addition for Tibetan sheep.[Method] 30 Tibetan sheep with one year old and similar body weight were selected and randomly divided into 3 groups.With the hay as basal diet,Tibetan sheep of each group were feed with concentrate supplied at 150,300,450 g/d.A single factor grouping design was taken to study effect of concentrate supplementing levels on feed intake,feed conversion efficiency and economic benefit of Tibetan sheep.[Result] The intake of diet and average daily gain （ADG） was increased significantly with the rise of concentrate supplementing level and the hay intake showed a little decreasing tread.Under different concentrate supplementing levels,the daily gain of Tibetan sheep tended to decrease in the latter fattening period.The conversion efficiency of concentrate and intake per day changed as quadratic curve with the rise of concentrate supplementing level.The conversion efficiency and economic benefit of concentrate and diet in the treating group with 300 g/d concentrate was the highest.[Conclusion] The optimum feeding time for Tibetan Sheep was 45-50 d and the concentrate addition of 300 g/d was the best.