1. Clinic for Ruminants with Ambulatory and Herd Health Services at the Centre for Clinical Veterinary Medicine; LMU Munich, Sonnenstraße 16; 85764 Oberschleißheim Germany
2. Bavarian Animal Health Service (Tiergesundheitsdienst Bayern e.V.), Senator-Gerauer-Str. 23; 85586 Poing Germany
3. Department of Veterinary Clinical Medicine, College of Veterinary Medicine; University of Illinois, Urbana-Champaign; Illinois