1. College of Veterinary Medicine Sichuan Agricultural University Cheng Du Sichuan Province China
2. Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province Sichuan Agriculture University Wenjiang Chengdu China
3. Key Laboratory of Animal Disease and Human Health of Sichuan Province Sichuan Agricultural University Cheng Du Sichuan Province China
4. College of Animal Science, Xichang University Xichang Sichuan Province China