1. School of Agroforestry and Medicine, The Open University of China, Beijing 100039, China.
2. Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, Beijing 100176, China.
3. College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China.
4. School of Modern Agriculture & Biotechnology, Ankang University, Ankang 725000, China.