1. Department of Nutrition and Food Sciences, Bioanalytics, University of Bonn, Endenicher Allee 11-13, D-53115 Bonn, Germany
2. Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, An der Immenburg 4, D-53121 Bonn, Germany
3. Divison of Applied Ecology, Fraunhofer Institute, Auf dem Aberg 1, D-57392 Schmallenberg, Germany
4. Institute of Animal Science, Animal Breeding and Husbandry Group, University of Bonn, Endenicher Allee 15, D-53115 Bonn, Germany
5. Institute of Animal Science, Preventive Health Management, University of Bonn, Katzenburgweg 7-9, D-53115 Bonn, Germany