1. Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki, Miyazaki 889-1692, Japan
2. Laboratory of Theriogenology, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Gakuen-kibanadai Nishi 1-1, Miyazaki, Miyazaki 889-2192, Japan
3. Theriogenology Department, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
4. Theriogenology Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt