1. Animal Nutrition Group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, the Netherlands
2. Adaptation Physiology Group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, the Netherlands
3. INRA-UMR 1348 Pegase, 35590, Saint-Gilles, France
4. Agrocampus Ouest – UMR1348 PEGASE, 35000 Rennes, France
5. Department of Human Genetics, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, the Netherlands