1. Department of Planning and Coordination National Livestock Breeding Center Fukushima Japan
2. Department of Bioresource Sciences Nihon University Fujisawa Japan
3. Division of Pathology and Pathophysiology National Institute of Animal HealthNational Agriculture and Food Research Organization (NARO) Ibaraki Japan
4. Department of Veterinary Medicine Azabu University Sagamihara Japan
5. Division of Animal Sciences Institute of Agrobiological Sciences NARO Ibaraki Japan
6. The United Graduate School of Veterinary Science Yamaguchi University Yamaguchi Japan