1. College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, China
2. Key Laboratory of Bovine Disease Control in Northeast China, Ministry of Agriculture and Rural affairs, Daqing 163319, China
3. Engineering Research Center for Prevention and Control of Cattle Diseases, Daqing 163319, Heilongjiang Province, China
4. Agriculture and Rural Bureau of Sinan County, Sinan 565100, Guizhou Province, China