1. National Institute of Technology, Asahikawa College, 2-2-1-6 Shunko-dai, Asahikawa 071-8142, Japan
2. Japan Blood Horse Breeders’ Association, 517 Tahara, Shizunai, Shinhidaka 056-0144, Japan
3. National Institute of Technology, Tomakomai College, 443 Nishikioka, Tomakomai 059-1275, Japan