1. Comparative Agricultural Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
2. The Japan Bloodhorse Breeders’ Association, 4-5-4 Shinbashi, Minato-ku, Tokyo 105-0004, Japan
3. JRA Facilities Co. Ltd., 4-5-4 Shinbashi, Minato-ku, Tokyo 105-0004, Japan
4. Hidaka Training and Research Center, Japan Racing Association, 535-13 Nissha, Urakawa-cho, Hidaka, Hokkaido 057-0171, Japan
5. Equine Research Institute, Japan Racing Association, 321-4 Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan