1. MTT Agrifood Research Finland, Animal Production Research; Halolantie 31 A, FI-71750 Maaninka Finland
2. Department of Agricultural Sciences; University of Helsinki; Latokartanonkaari 5 FI-00014, University of Helsinki Finland
3. Soils and Crops Research and Development Centre; Agriculture and Agri-Food Canada; 2560 Hochelaga Blvd. Québec QC Canada G1V 2J3