1. Animal Health Service, Thuringian Animal Health Fund, Jena, Germany
2. Department of Animal Husbandry, Thuringian State Institute for Agriculture, Jena, Germany
3. Thuringian Ministry of Labour, Social Affairs, Health, Women and Family, Erfurt, Germany
4. Clinic for Poultry, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
5. Clinic for Obstetrics, Gynaecology and Andrology with Veterinary Ambulance, Justus-Liebig-University Giessen, Giessen, Germany