1. Central Laboratory, Department of Clinical Studies, The Royal Veterinary and Agricultural University, 13 Bülowsvej, DK‐1870 Frederiksberg C, Denmark
2. *Small Animal Hospital, Department of Clinical Studies, The Royal Veterinary and Agricultural University, 13 Bülowsvej, DK‐1870 Frederiksberg C, Denmark
3. †Section of Reproduction. Department of Clinical Studies, The Royal Veterinary and Agricultural University, 13 Bülowsvej, DK‐1870 Frederiksberg C, Denmark