1. Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of the Ministry of Education and Key Laboratory of Swine Genetics and Breeding of the Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, P. R. China
2. Guangxi Guigang Super Gene Technology Co. Ltd, Guigang, Guangxi, P. R. China
3. The Cooperative Innovation Center for Sustainable Pig Production of Hubei Province, Wuhan, Hubei, P. R. China