1. Branch of Animal Husbandry and Veterinary of Heilongjiang Academy of Agricultural Sciences , Qiqihar 161005 , China
2. Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University , Harbin 150030 , China
3. College of Veterinary Medicine, Qingdao Agricultural University , Qingdao, 266109 , China
4. Soybean Research Institute, Heilongjiang Academy Agriculturalof Science , Haerbin,150086 , China