1. Department of Animal Medicine, Production and Health Viale dell'Università 16, University of Padova Legnaro 35020 Italy
2. Department of Biomedical Sciences Melbourne Veterinary School, Faculty of Science Melbourne VIC Australia
3. Department of Production Animals, Faculty of Veterinary Science University of Pretoria Onderstepoort Pretoria South Africa
4. Dept of Animal and Rangeland Sciences Oregon State University 112 Withycombe Hall Corvallis OR 97331 USA
5. Department of Veterinary Clinical Sciences, Cummings School of Veterinary Medicine Tufts University North Grafton MA 01536 United States
6. Center for Reproduction Vetmeduni Vienna, Veterinärplatz 1 Vienna 1210 Austria