1. Department of Veterinary Medicine, Faculty of Applied Biological Sciences, Gifu University,1-1 Yanagido, Gifu 501-1193, Japan
2. Laboratory of Racing Chemistry, 1731-2 Tsurutamachi, Utsunomiya, Tochigi 320-0851, Japan
3. University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan