1. Economic Research, Agrifood Research Finland, Latokartanonkaari 9, 00790 Helsinki, Finland
2. Department of Cattle Breeding, University of Agriculture in Krakow, 30-059 Kraków, Al. Mickiewicza 24/28, Poland
3. Department of Large Animal Sciences, University of Copenhagen, Grønnegårdsvej 2, DK-1870 Frederiksberg C, Denmark