1. Laboratory of Nutritional Physiology and Feeding, Department of Animal Science, Agricultural University of Athens, Athens, Greece
2. Department of Mathematics and Statistics, Faculty of Natural Resources Management and Agricultural Engineering, Agricultural University of Athens, Athens, Greece
3. Department of Agriculture, Hellenic Mediterranean University, Heraklion, Crete, Greece
4. Institute of Animal Nutrition, Freie Universität Berlin, Berlin, Germany
5. School of Environmental, Geography and Applied Economics, Harokopio University, Athens, Greece