1. Institute of Animal Science; University of Bonn; Bonn Germany
2. Institute for Animal Nutrition and Feed Management; Bavarian State Research Centre for Agriculture (LfL); Poing Germany
3. Agricultural Centre for Cattle Production; Grassland Management, Dairy Management, Wildlife and Fisheries Baden-Württemberg; Aulendorf Germany
4. Animal Nutrition Weihenstephan; Technical University of Munich; Freising Germany
5. Adisseo Europe-Africa-Middle East; Antony France