1. Clinical Unit for Herd Health Management in Ruminants, University Clinic for Ruminants, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210 Vienna, Austria
2. Institute of Milk Hygiene, Milk Technology and Food Science, Veterinaerplatz 1, 1210 Vienna, Austria
3. First Farms A/S, 900 68 Plavecký Štvrtok, Slovakia