1. Laboratory of Animal Genetics and Reproduction, Department of Animal Science, Research Faculty of Agriculture, Hokkaido University, Hokkaido 060-8589, Japan
2. Department of Theriogenology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
3. Laboratory of Reproductive Physiology, Graduate School of Environmental and Life Science, Okayama University, Okayama 700-8530, Japan
4. Animal Breeding and Reproduction Research Division, NARO Institute of Livestock and Grassland Science, Ibaraki 305-8517, Japan
5. Laboratory of Animal Breeding, Veterinary Medical Sciences, Graduate School of Agricultural and Life Science, The University of Tokyo, Tokyo 113-8657, Japan
6. National Institute of Animal Science, Animal Genetic Resources Research Center, Namwon 590-832, Republic of Korea
7. Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Hokkaido 060-8589, Japan