Author's Organization:Department of Veterinary Pharmacology,Obihiro University of Agriculture and Veterinary Medicine Department of Veterinary Pharmacology,Obihiro University of Agriculture and Veterinary Medicine Department of Veterinary Pharmacology,Obihiro University of Agriculture and Veterinary Medicine Department of Veterinary Anatomy,Obihiro University of Agriculture and Veterinary Medicine Department of Animal Hygiene,Azabu Veterinary College