Affiliation: | Department of Animal Science, Agricultural University of Norway, P.O. Box 5025, N-1432 ?s, Norway, NO Department of Morphology, Genetics and Aquatic Biology, Norwegian College of Veterinary Medicine, P.O. Box 8146 Dep., N-0033 Oslo, Norway, NO Agricultural Research Centre MTT, Animal Production Research, Animal Breeding, FIN-31600 Jokioinen, Finland, FI
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