1. Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
2. Department of Basic Veterinary, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
3. Department of Pharmacy, College of Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China