1. Animal Health Unit, Graduate School of Veterinary Medicine, Veterinary Medicine Doctoral Course, Rakuno Gakuen University, Hokkaido, Japan
2. Animal Health Unit, Department of Veterinary Science, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido, Japan
3. Theriogenology Unit, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido, Japan
4. Monbetsu Veterinary Clinic, Hokkaido Agricultural Mutual Aid Association, Hokkaido, Japan
5. Veterinary Biochemistry Unit, Department of Veterinary Science, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido, Japan