1. College of Animal Science, Guangdong Province Key Laboratory of Animal Nutritional Regulation, National Engineering Research Center for Breeding Swine Industry, State Key Laboratory of Swine and Poultry Breeding Industry, South China Agricultural University , Guangzhou, Guangdong 510642 , China
2. Department of Physiology, College of Medicine, Jiaxing University , Jiaxing, Zhejiang 314000 , China