1. College of Animal Science and Technology, Jilin Provincial Engineering Research Center of Animal Probiotics, Jilin Agricultural University, Changchun, PR China;
2. Key Laboratory of Animal Production and Product Quality Safety of Ministry of Education, Jilin Agricultural University, Changchun, PR China;
3. Shandong Provincial Key Laboratory of Animal Micro-Ecological Agent, Shandong BaoLai-LeeLai Bioengineering Co., Ltd, Tai’an, PR China