1. Sub-Department of Clinical Diagnostics and Veterinary Dermatology, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, 20-612 Lublin, Poland.
2. Institute of Mathematics, Marie Curie-Skłodowska University, 20-031 Lublin, Poland.
3. Equine Breeding and Management Unit, Department of Biology and Animal Breeding, University of Life Sciences in Lublin, 20-950 Lublin, Poland.
4. Nicolaus Copernicus University in Torun, Faculty of Biological and Veterinary Sciences, 87-100 Torun, Poland.