| Affiliation: | (1) Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Box 7023, S-750 07 Uppsala, Sweden;(2) Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University, Bülowsvej 13, DK-1870 Fredriksberg C, Denmark;(3) Institute of Biotechnology, University of Helsinki, Valimotie 7, SF-00380 Helsinki, Finland;(4) Present address: Department of Genetics, University of Helsinki, Arkadiankatu 7, P.O. Box 17, SF-00014 Helsinki, Finland |
