1. College of Life Sciences, Key Laboratory of Animal Reproduction and Biotechnology in Universities of Shandong Qingdao Agricultural University Qingdao China
2. College of Animal Science and Veterinary Medicine Shandong Agricultural University Tai′an China
3. College of Animal Science and Technology Qingdao Agricultural University Qingdao China
4. State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, College of Life Sciences Inner Mongolia University Hohhot China
5. Dongying Vocational Institute Dongying China