1. Department of Molecular Sciences, Swedish University of Agricultural Sciences , Uppsala, SE-750 07 , Sweden
2. Norrmejerier , Umeå, SE-906 22 , Sweden
3. Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences , Umeå, SE-901 83 , Sweden
4. Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences , Uppsala, SE-750 07 , Sweden