1. National Engineering Laboratory for Animal Breeding; Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture; Beijing Key Laboratory for Animal Genetic Improvement; College of Animal Science and Technology; China Agricultural University; Beijing China
2. Institute of Animal Husbandry and Veterinary; Academy of Agricultural Sciences of Tianjin; Tianjin China
3. State Key Laboratory of Stem Cell and Reproductive Biology; Institute of Zoology; Chinese Academy of Sciences; Beijing China
4. State Key Laboratory of Animal Nutrition; College of Animal Science and Technology; China Agricultural University; Beijing China