1. College of Animal Science and Technology, Guangxi University, Nanning 530004, China
2. Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning 530004, China
3. School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
4. Hunan Institute of Animal and Veterinary Science, Changsha 410131, China