1. College of Life Science, Shanxi Agricultural University, Taigu, Shanxi, 030801, China
2. Wujiang River Institute of Agriculture & Forestry Economics of Tongren University, Tongren, Guizhou, 554300, China
3. Laboratory of Mammalian Reproductive Biology and Genomics, Department of Animal Science, Michigan State University, East Lansing, MI 48824, United States
4. College of Animal Science and Technology, Shanxi Agricultural University, Taigu, Shanxi, 030801, China