1Jueken Aniwashl, Hubdar All Kalerl, Yiming Sulaiman, et al. Comparative analysis on the performance of the hybrid offspring of wild argali and Bashibay Sheep [J]. African Joumal of Biotechnology,2011,28(10) :5539 5544.
2CHU Mingxing, ZHUANG Haibin, ZHANG Yingjie, et al. Growth and reproductive performance of Poll Dorset and Suffolk sheep under intensive conditions. Revista Mexi- cana De Ciencias Pecuarias, 2011,2 : 359-369.
3Fernandes M H,Resende K T,Tedeschi L. Energy and pro tein requirements for maintenance and growth of Boer crossbred kids. Journal of Animal Science, 2007,85 (4) : 1014-1023.
4The people's republic of China agriculture industry standard(中华人民共和国国农业行业标准). Feeding standard f meat- producing sheep and goats(肉羊饲养标准) NY/T 816-2004[S]. Beijing: Ministry of Agriculture of the People' s Republic of China, 2004 :2-8.
5Vera M,Angelika B,et al. Effects of two different housing systems on behavior, physiology and milk yield of Comisa- na ewes. Small Ruminent Research,2001(41) 151-161.
6LIHua(李华),SHIXiaoping(史小平),WANGJie(王捷),et al. Effects of the experimental animal welfare on Cage and rearing density[J].中国比较医学杂志,2004,14(6):50.
7The national standard of the people's republic of China(中华人民共和国国家标准).The experimental animal conditions and facilities(实验动物环境与设施) GB 14925-2001 [S]. Beijing: Ministry of Agriculture of the People's Republic of China,2001:4-5.