1. Chair of Dairy Science, Institute of Veterinary Food Science, Veterinary Faculty, Justus Liebig-University, Ludwigstrasse 21, 35390 Giessen, Germany
2. Chair of Hygiene and Technology of Milk, Department of Veterinary Sciences, Veterinary Faculty, Ludwig-Maximilians-University of Munich, Schönleutnerstrasse 8, 85764 Oberschleissheim, Germany