1. College of Animal Science and Technology, Anhui Agricultural University, 130 West Changjiang Road, Hefei 230036, China
2. Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China
3. College of Animal Science and Technology, Inner Mongolia Minzu University, 028000 Tongliao, China