1. Lab. of Theriogenology, College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
2. Research Institute of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
3. Department of Physiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt
4. Department of Companion Animal, Shingu College, Seongnam 13174, Korea