1. Institute of Preventive Veterinary Medicine, Zhejiang University, Hangzhou, Zhejiang 310058, China
2. Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, China
3. College of Life Science and Technology, Southwest University for Nationalities, Chengdu, Sichuan, 610041, China