1. College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi, China.
2. College of Food Science, Shanxi Normal University, Taiyuan, Shanxi, China.
3. College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, China.
4. Sichuan Animal Disease Prevention and Control Center, Chengdu, China.