1. Department of Animal Genetics; Breeding and Reproduction; College of Animal Science and Technology; Nanjing Agricultural University; Nanjing China
2. Huaian Academy of Nanjing Agricultural University; Huaian Jiangsu China
3. Key Laboratory of Swine Genetics and Breeding; Ministry of Agriculture; Key Lab of Agriculture Animal Genetics; Breeding and Reproduction; Ministry of Education; College of Animal Science; Huazhong Agricultural University; Wuhan Hubei China