1. College of Animal Science and Technology, Guangxi University, Nanning 530004, China
2. Guangyuan Academy of Agricultural Sciences, Guangyuan 628017, China
3. State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Breeding and Disease Control, College of Animal Science and Technology, Guangxi University, Nanning 530004, China