KOBAYASHI Yoshiyasu Professor

ThemePathogenesis studies of naturally occurring animal diseases and lesions using pathologic methods

My DreamTo reveal pathogenesis of unelucidated diseases and lesions
Field (Veterianry) Pathology, Diagnostic Pathology
Keyword Diagnostic Pathology, Experimental Pathology, Infectious Diseases, Neoplastic Diseases, Degenerative Diseases, Neuropathology, Perinatal Diseases, Molecular Pathology


There are many unelucidated diseases and lesions in animals. Therefore, my research works are aimed 1) to reveal the pathogenesis of newly recognized diseases/lesions, and 2) to reveal the unresolved points of the known disease/lesions via routine diagnostic services. In addition, I also carry out some pathogenesis study using animal experiments.

List of current research topics

Diagnostic pathology based research works:

  • Bovine virus diarrhea virus associated diseases: search for novel disease states
  • Perinatal brain damages in calves
  • Glomerular lesions and renal dysplasia of various animals species
  • Papillomavirus associated diseases (tumors) of various animals species
  • Protozoan diseases of various animals species
  • Neoplastic diseases of various animals species
  • Diseases in sea mammals etc

Experimental Research Works (mainly as collaborative works)

  • Pathological analyses for infectious diseases (bacterial, protozoan & viral diseases)
Academic degree PhD
License Veterinarian, Diplomate JCVP (Japanese College of Veterinary Pathologists)
Self introduction

I am continuing my research works to clarify the mechanisms of various diseases and lesions. Because there are many unexplained diseases and lesions, I would like to reveal these issues as many as possible.

Room addressGeneral Research Building 1
Mail address kyoshi atmark obihiro.ac.jp


Research Center for Global Agromedicine/Department of Veterinary MedicineResearch Department/Department of Veterinary Medicine/Division of Veterinary Sciences/Section of Anatomy and PathologyVeterinary Medical Center/Diagnostic ResouceOffice for International Accreditation of Veterinary Education/Chair
Affiliated academic society The Japanese Society of Veterinary Science, Japan Veterinary Medical Association, The Japanese College of Veterinary Pathologists, The Japanese Society of Veterinary Dermatology, The Japanese Society of Neuropathology
Academic background 1992 Department of Veterinary Medicine, Faculty of Agriculture,Tottori University (Graduated)
1996 Graduate School of Veterinary Medicine, Hokkaido University (Completed Doctor Degree)
1996 Postdoctoral Research Fellow of the Japan Society for the Promotion of Science
1998 Instructor, School of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
2005 Associate Professor, School of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
2012- Professor, Obihiro University of Agriculture and Veterinary Medicine