Irene Mueller-Harvey1, Aina Ramsay2, Christos Fryganas2, Honorata Ropiak2, Chris Drake2, Marina Mora Ortiz3, Lydia M.J. Smith3, Leif Skot4, Carsten Malisch5, Andreas Luescher6, Katharina Kempf7, Roland Kolliker8, Olivier Desrues9, Andrew R. Williams9, Stig M. Thamsborg9, Blasius N. Azuhnwi10, Jessica N. Quijada10, Hervé Hoste11, Marion Girard12, Anja Grosse Brinkhaus12, Frigga Dohme-Meier12, Giuseppe Bee13, Njuyen T Huyen14, Wilbert F. Pellikaan14, Giuseppe Copani15, Vincent Niderkorn15, Marica Engstrom16, Juha-Pekka Salminen17, Ian Wilkinson18, Paul Totterdell18 and Garry Waghorn19, (1)School of Agriculture, Policy and Development, University of Reading, Reading, UNITED KINGDOM, (2)SAPD, University of Reading, Reading, United Kingdom, (3)NIAB, Cambridge, United Kingdom, (4)IBERS, University of Aberystwyth, Aberystwyth, United Kingdom, (5)Agroscope, Zurich, SWITZERLAND, (6)Agroscope, Zurich, Switzerland, (7)ISS, Agroscope, Zuerich, Switzerland, (8)Agroscope Institute for Sustainability Sciences, Zurich, Switzerland, (9)Department of Veterinary Disease Biology, University of Copenhagen, Frederiksberg C, Denmark, (10)UMR1225 IHAP, INRA, Tolouse, France, (11)INRA, Toulouse, France, (12)Institute for Livestock Sciences, Agroscope, Posieux, Switzerland, (13)Agroscope, Posieux, Switzerland, (14)Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, Netherlands, (15)UR1213 Herbivores, INRA, St-Genès-Champanelle, France, (16)Department of Chemistry, University of Turku, Turku, Finland, (17)University of Turku, Turku, Finland, (18)Cotswold Seeds Ltd, Moreton-in-Marsh, United Kingdom, (19)DairyNZ, Hamilton, New Zealand