1. Department of Biotechnology, Northeast Agriculture University, Harbin, China and State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
2. Department of Biotechnology, Northeast Agriculture University, Harbin, China
3. State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
4. Department of Veterinary Medicine, Northeast Agriculture University, Harbin, China