1. Team Semin; PO Box 8146 Dep NO-0033 Oslo Norway
2. Department of Animal Science; Agricultural University of Norway; Ås Norway
3. GENO Al Station Saerheim; Sandnes Norway
4. Department of Obstetrics and Gynaecology; Faculty of Veterinary Medicine; Centre for Reproductive Biology in Uppsala; Swedish University of Agricultural Sciences; Uppsala Sweden
5. Department of Reproduction and Forensic Medicine; Norwegian School of Veterinary Science; Oslo Norway