1. Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Shaanxi, Yangling 712100, China
2. Bureau of Animal Husbandry of Biyang County, Biyang, Henan 463700, China
3. Animal Health Supervision of Henan Province, Bureau of Animal Husbandry of Henan province, Zhengzhou, Henan 450008, China