J. L. ELLIS *, J. DIJKSTRA , E. KEBREAB , A. BANNINK , N. E. ODONGO , B. W. MCBRIDE 1 AND J. FRANCE1 1Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, N1G 2W1, Canada Animal Nutrition Group, Wageningen Institute of Animal Sciences, Wageningen University, Marijkeweg 40, 6709 PG, Wageningen, The Netherlands 3Department of Animal Science, ...