1. Department of Animal Production; Ghent University; Coupure links 653 B-9000 Gent Belgium
2. Department of Crop Protection; Ghent University; Coupure links 653 B-9000 Gent Belgium
3. Department of Health, Animal Science and Food Safety (VESPA); The University of Milan; Via Celoria 10 I-20133 Milan Italy
4. Department of Animal Sciences (Animal production systems group); Wageningen University; P.O. Box 338 NL-6700 AH Wageningen The Netherlands
5. Department of Applied Biosciences; Ghent University; Valentin Vaerwyckweg 1 B-9000 Gent Belgium
6. Trevi NV; Dulle-Grietlaan 17/1 B-9050 Gentbrugge Belgium
7. Department of Food Safety and Food Quality; Ghent University; Coupure links 653 B-9000 Gent Belgium