1. Clinic of Reproductive Medicine; Vetsuisse-Faculty University Zurich; Zurich Switzerland
2. Institute of Veterinary Bacteriology; Vetsuisse-Faculty University Zurich; Zurich Switzerland
3. Section of Ambulatory Field Clinic and Herd Health; Vetsuisse-Faculty University Zurich; Zurich Switzerland
4. Institute of Animal Nutrition (Liesegang); Vetsuisse-Faculty University Zurich; Zurich Switzerland