1. College of Veterinary Medicine, Qingdao Agricultural University, Qingdao 266100, China
2. Analytical & Testing Center of Qingdao Agricultural University, Qingdao 266100, China
3. Animal Husbandry General Station of Shandong Province, Jinan 250010, China
4. Saint Camillus International University of Health Sciences, Rome 00131, Italy
5. College of Life Sciences, Key Laboratory of Animal Reproduction and Biotechnology in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China