1. Department of Clinical Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, China
2. Key Laboratory of Animal Biotechnology of the Ministry of Agriculture, Northwest A&F University, Yangling, China
3. Department of Physiology, Key Laboratory of Cellular Physiology, Ministry of Education, Shanxi Medical University, Taiyuan, China
4. Medical Experiment Centre, Shaanxi University of Chinese Medicine, Xianyang, China
5. Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, China