1. College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
2. Taixing Animal Husbandry and Veterinary Center, Taizhou, Jiangsu Province, China
3. Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Zhejiang Institute of Microbiology, Hangzhou, Zhejiang Province, China