CIGENE/Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Aas, Norway. lg@camo.no|CIGENE/Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Aas, Norway. lg@camo.no|CIGENE/Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Aas, Norway. lg@camo.no|CIGENE/Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, N-1432 Aas, Norway. lg@camo.no