1. State Key Laboratory of Animal Biotech Breeding, College of Animal Science and Technology, China Agricultural University , Beijing, China
2. School of Municipal and Environmental Engineering, Shandong Jianzhu University , Jinan, China
3. State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Science, Inner Mongolia University , Hohhot, China
4. Beijing Jingwa Agricultural Science & Technology Innovation Center , Beijing 101202, China