摘要
在青草期进行８８天牦牛放牧加补词精料试验。试验组和对照组分别有混合群牦牛１０３头，６２头，试验组每日每头补饲混合精料０．２５ｋｇ。试验结果：２岁牦牛增重效果最好，增重率提高２０．１个百分点，３岁牦牛次之，增重率提高１４．５个百分点，４岁牦牛最差，增重率提高４．９个百分点；在同年龄组内，２、３岁试验组牦牛体重比对照组分别提高５０．８％、９．７％，经ｔ检验差异均极显著（Ｐ＜０．０１），４岁牦牛差异不显著（Ｐ＞０．０５）。试验结果说明，试验点的夏季草地不能完全满足牦牛生长发育的营养需要，同时还表明，牦牛对夏季草地的适应能力随年龄的增长而提高。
yak herds respectively containing 103(experiment group)and 62(controlgroup)yaks grazed in green grass land were used in a 88-day test,0.25kg concentrate wassupplemented to each animal each day for the experiment group and nothing for the controlgroup.As compared with control group,weight gain rates of yaks aged2,3,4 years in experi-ment group increased by 20.1,14.5 and 4.9 percent unit resp.body weight of 2 and 3 year-oldyak increased by 50.8%and 9.7%(P<0.01),while no body weight increase for 4-year old yakwas found.The result suggest that the summer grassland can not supply sufficient hutrients re-quired by growing yaks,and the adaptability of yak to the summer grassland increases with the age.
出处
《青海畜牧兽医杂志》
1996年第5期5-6,共2页
Chinese Qinghai Journal of Animal and Veterinary Sciences
关键词
青草期
补饲精料
增重
牦牛
放牧
Green grassland,Concentrate supplement,Weight gain,Yak
