1. State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
2. Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
3. National Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China
4. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China
5. Tianjin Institute of Animal Sciences, Tianjin 300112, China