1. Department of Animal Physiology and Biostructure; Faculty of Veterinary Medicine; Wroclaw University of Environmental and Life Sciences; Wroclaw Poland
2. Museum of Natural History of the Faculty of Biology and Animal Science; Wroclaw University of Environmental and Life Sciences; Wroclaw Poland
3. Electron Microscopy Laboratory; Faculty of Biology and Animal Science; Wroclaw University of Environmental and Life Sciences; Wroclaw Poland
4. Department of Morphological Sciences; Faculty of Veterinary Medicine; Warsaw University of Life Sciences; Warsaw Poland
5. Division of Poultry Breeding; Faculty of Biology and Animal Science; Wroclaw University of Environmental and Life Sciences; Wroclaw Poland