1. College of Animal Science, South China Agricultural University/Guangdong Provincial Key Laboratory of Animal Nutrition Control/National Engineering Research Center for Breeding Swine Industry, Guangzhou, Guangdong 510642, China
2. College of Letters & Science, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
3. Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, Guangdong 510642, China
4. Department of Animal Science, University of Arkansas, Fayetteville, Arkansas 72701, United States
5. Department of animal science, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada