1. College of Animal Science and National Engineering Research Center for Breeding Swine Industry, South China Agricultural University , Guangzhou 510642 , PR China
2. State Key Laboratory of Livestock and Poultry Breeding/Guangdong Key Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences , Guangzhou 510640 , PR China
3. Guangdong Provincial Key Laboratory of Agro-animal Genomics and Molecular Breeding, South China Agricultural University , Guangzhou 510642 , PR China
4. Guangdong Zhongxin Breeding Technology Co., Ltd , Guangzhou 511400 , PR. China
5. College of Animal Science and Technology, Zhongkai University of Agriculture and Engineering , Guangzhou 510225 , PR China
6. Yunfu Subcenter of Guangdong Laboratory for Lingnan Modern Agriculture , Yunfu 527400 , PR China