1. Clinic for Reproductive Medicine; Vetsuisse-Faculty; University of Zurich; Winterthurerstrasse 260 8057 Zurich Switzerland
2. Department of Preventive Veterinary Medicine and Animal Reproduction; School of Agricultural and Veterinarian Sciences; São Paulo State University (Unesp); 14884-900 Jaboticabal São Paulo Brazil
3. Vetsuisse-Faculty; Institute of Genetics; University of Bern; Bremgartenstrasse 109a 3012 Bern Switzerland
4. Division of Livestock Sciences; Department of Sustainable Agricultural Systems; University of Natural Resources and Life Sciences; Gregor Mendel Straße 33 1180 Vienna Austria
5. Vetsuisse-Faculty; Clinic for Reproductive Medicine and Center of Clinical Studies; University of Zurich; Eschikon 27, EHB F 22.1 8315 Lindau Switzerland