1. State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou, China.
2. College of Animal Science and Technology, Southwest University, Chongqing 400715, China.
3. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China.
4. College of Nursing, Yangzhou University, Yangzhou 225009, China.
5. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.