1. Laboratory of Reproductive Endocrinology, Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
2. Department of Animal Breeding and Genetics, Bangabandhu Sheikh Mujibur Rahman Agricultural University , Gazipur, Bangladesh
3. Graduate School of Integrated Sciences for Life, Hiroshima University , Higashi-Hiroshima, Hiroshima, Japan
4. Livestock Improvement Association of Japan Inc. , Tokyo, Japan