1. Research Units Nutritional Physiology “Oskar Kellner”, Research Institute for the Biology of Farm Animals Dummerstorf, D-18196 Dummerstorf, Germany
2. Institute of Experimental Internal Medicine, Research Center Immunology, Otto-von-Guericke-University Magdeburg, D-39120 Magdeburg, Germany
3. Research Units Nutritional Physiology Molecular Biology, Research Institute for the Biology of Farm Animals Dummerstorf, D-18196 Dummerstorf, Germany