1. Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan
2. Department of Theriogenology, Faculty of Veterinary Medicine, Damanhur University, Behera, Egypt
3. Department of Theriogenology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
4. Department of Theriogenology, Faculty of Veterinary Medicine, Assiut University, Assiut, Egypt
5. Research Institute of Agriculture, Tokai University, Kumamoto, Japan
6. Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan