1. Institute of Veterinary Anatomy; Vetsuisse Faculty; University of Zurich; Zurich Switzerland
2. Clinic of Reproductive Medicine; Vetsuisse Faculty; University of Zurich; Zurich Switzerland
3. Department of Physiology; Institute of Biomedicine; University of Turku; Turku Finland
4. Centro de Ciência Animal e Veterinária (CECAV); Zootecnia Department; University of Trás-os-Montes and Alto Douro; Vila Real Portugal