1. Animal Nutrition Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen University and Research Centre, 6700 AH Wageningen, The Netherlands
2. Centre for Isotope Research (CIO), University Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
3. Olds College Centre for Innovation, Olds, AB, Canada, T4H 1R6