1. Swiss Institute of Equine Medicine ISME; Agroscope and University of Berne; Avenches Switzerland
2. Department of Clinical Research; Vetsuisse Faculty; University of Berne; Berne Switzerland
3. Department of Ecology and Evolution; Biophore; University of Lausanne; Lausanne Switzerland
4. Clinic of Reproductive Medicine; Vetsuisse Faculty; University of Zurich; Zurich Switzerland
5. Unit for Reproductive Medicine - Clinic for Horses; University of Veterinary Medicine Hannover; Hannover Germany