1. State Key Laboratory of Pig Genetic Improvement and Production Technology; Jiangxi Agricultural University; 330045 Nanchang China
2. Department of Animal Science; Jiangxi Biotech Vocational College; 330200 Nanchang China
3. Unit of Animal Genetics and Breeding; Institute of Animal Science of Pingxiang; Pingxiang 347850 China
4. Institute of Animal Husbandry and Veterinary; Jiangxi Academy of Agricultural Sciences; Nanchang 330200 China