1. Laboratory of Animal Production Science, Graduate School of Bioagricultural Sciences, Nagoya University, Aichi, Japan
2. Faculty of Veterinary Medicine, Okayama University of Science, Ehime, Japan
3. Department of Anatomy and Neurobiology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
4. Division of Animal Sciences, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Ibaraki, Japan
5. Asian Satellite Campuses Institute, Nagoya University, Nagoya, Japan
6. Laboratory of Reproductive Physiology, Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan