1. Department of Farm Animals
2. Diagnostic Imaging
3. Institute of Animal Nutrition
4. CH-7175 Sumvitg Switzerland
5. Extension and Health Service for Small Ruminants ESSR; CH-3360 Herzogenbuchsee Switzerland
6. Institute of Veterinary Pathology; University of Zurich; Winterthurerstrasse 260 CH-8057 Zurich Switzerland