1. Institute of Animal Nutrition, Nutrition Diseases and Dietetics, University of Leipzig, An den Tierkliniken 9, 04103 Leipzig, Germany
2. Main and State Stud Marbach, Gestütshof 1, 72532 Gomadingen-Marbach, Germany
3. Agricultural Center Baden-Württemberg of Cattle, Grassland Management, Dairy Farming, Fisheries and Wildlife (LAZBW), Atzenberger Weg 99, 88326 Aulendorf, Germany
4. Agricultural Technology Center Augustenberg, Neßlerstraße 25, 76227 Karlsruhe, Germany
5. Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173 Hannover, Germany