1. Department of Grassland and Livestock; Norwegian Institute of Bioeconomy Research; Holt 9016 Tromsø Norway
2. Department of Plant Sciences; Faculty of Biosciences, Norwegian University of Life Sciences; 1432 Ås
3. Department of Plant Physiology; University of Agriculture in Krakow; 30-239 Krakow Poland
4. Department of Grassland and Livestock; Norwegian Institute of Bioeconomy Research, Fureneset; 6967 Hellevik i Fjaler Norway
5. Graminor AS, Bjørke gård; Hommelstadvegen 60; 2322 Ridabu Norway
6. Faculty of Bioscience, Fisheries and Economics; UiT - The Arctic University of Norway; Tromsø 9037 Norway