1. Department of Reproduction, Obstetrics and Herd Health, Ghent University, Merelbeke, Belgium.
2. Laboratory of Biochemistry, Ghent University, Merelbeke, Belgium.
3. Department of Morphology, Ghent University, Merelbeke, Belgium.
4. Department of Comparative Physiology and Biometrics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
5. Department of Basic Medical Sciences, Faculty of Medicine, Ghent University, Ghent, Belgium.