1. College of Animal Science and Technology, Hebei Normal University of Science &Technology, Qinhuangdao 066600, PR China
2. University of Chinese Academy of Sciences, Beijing, 100049, PR China
3. Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Sichuan 610041, PR China