1. Clinic for Birds, Reptiles, Amphibians and Fish, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Germany
2. Zoo Wuppertal, Wuppertal, Germany
3. Department of Reproductive Biology, University of Veterinary Medicine, Hannover, Germany
4. Clinic for Obstetrics, Gynecology and Andrology of Large and Small Animals, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Germany