1. Laboratory of Reproductive Physiology, Graduate School of Agriculture, Tottori University, Tottori 680-8553, Japan
2. Laboratory of Theriogenology, Joint Department of Veterinary Medicine, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
3. Joint Department of Veterinary Clinical Medicine, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
4. Laboratory of Crop Husbandry, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan
5. Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan