1. Veterinary Centre, Nicolaus Copernicus University in Torun , Torun , Poland
2. Department of Anatomy, Poznan University of Medical Sciences , Poznan , Poland
3. Department of Histology and Embryology, Poznan University of Medical Sciences , Poznan , Poland
4. Department of Obstetrics and Gynecology, University Hospital and Masaryk University , Brno , Czech Republic