1. Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, Am Gereuth 8, Freising, Germany
2. Physiology Weihenstephan, Technische Universität München, Weihenstephaner Berg 3, Freising, Germany
3. Institute for Animal Nutrition and Feed Management, Bavarian State Research Center for Agriculture, Prof.-Dürrwächter-Platz 3, Poing, Germany