1. College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
2. Heilongjiang Provincial Key Laboratory of Prevention and Control of Bovine Diseases, College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, China
3. College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
4. Institute of Veterinary Medicine, Mongolian University of Life Sciences, Zaisan, Ulaanbaatar 17024, Mongolia
5. State Central Veterinary Laboratory, P. O.
Box 53/33, Zaisan, Ulaanbaatar 210153, Mongolia