Abstract
1 Ghent University, Faculty of Veterinary Medicine, Department of Surgery and Anaesthesiology of Domestic Animals, Salisburylaan 133, B-9820 Merelbeke, Belgium
2 Ghent University, Faculty of Veterinary Medicine, Department of Nutrition, Genetics and Ethology, Heidestraat 19, B-9820 Merelbeke, Belgium
3 Ghent University, Faculty of Veterinary Medicine, Department of Obstetrics, Reproduction and Herd Health, Salisburylaan 133, B-9820 Merelbeke, Belgium
4 Ghent University, Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Avian Diseases, Salisburylaan 133, B-9820 Merelbeke, Belgium