Studies on Effects on Productivity of Tan Sheep Under Different Grazing Intensity

There were five different grazing intensities, it was studied on the grazing of Tan sheep in 154 days. The results showed that: Feed intake of Tan sheep decreased as the grazing intensity became heavier. Under the same grazing intensity, feed intake increased at first, and then decreased as the time passed. The live weight of Tan sheep appeared increasing tendency as the time passed under the different grazing intensity, but the peak figure of ADG under the lighter grazing intensities was higher and lasted longer. There was negative correlation between the live weight gain per sheep and the grazing intensity. There was positive correlation between the live weight gain per hectare and the grazing intensity. Feed conversion increased at first, and then decreased as the grazing intensity became heavier. Under the same grazing intensity, feed conversion increased at first, then decreased as the time passed. After the grazing intensity over 0.750sheep/hm2, the barren rate of tan sheep rose, the lambing percentage dropped and the pregnant time postponed. Considering the different research index, the grazing intensity of this type range ought not to overtake 0.750sheep/hm2.