1. Department of Nutrition, Genetics and Ethology, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
2. Department of Obstetrics, Reproduction and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium
3. Department of Clinical Biology, Microbiology and Immunology, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium
4. Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, 9090 Melle, Belgium
5. Laboratory of Neurochemistry and Behavior, Institute Born-Bunge, University of Antwerp, 2000 Antwerp, Belgium