1. Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
2. Zugspitzstr. 15 1/2, 82131 Stockdorf, Germany
3. Ruminant Nutrition, Department of Animal Sciences, University of Göttingen, Kellnerweg 6, 37077 Göttingen, Germany