Influence of feeding patterns on production efficiency of sheep in the cold season

Sheep in three households were selected with same pasture type and similar sheep body condition in Sunan County, one household fed sheep in the heated greenhouses from Jan. to Apr.(Group Ⅰ), and the second household grazed sheep in pasture in day and supplement after come back (Group Ⅱ), another household grazed only, act as control group. Sheep's body weight loss in total reproductive cycle, ewes reproductive rate and lamb living rate were recorded to determine the influence of feeding patterns on production efficiency of sheep. The results of this study showed the difference of ewes body weight loss among three groups was obvious after cold season, and the body weight of Group Ⅰ,Ⅱ and control increased 2.76, 1.91 and -1.24 kg in next mating time respectively. Conception rate and pregnancy rate of Group Ⅰ and Ⅱ were significantly higher than that of control group. Wool yield of GroupⅠ was significantly higher than that of GroupⅡ and control (P0.01). However, there was not significant difference between GroupⅡ and control (P0.05). Economic analysis showed that the feeding costs and the net income of GroupⅠ were the highest, and those of control was the lowest. However, the ratio of revenue and cost in control was the highest, and those of Group I was the lowest.