1 Department of Internal Diseases with Clinic, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego Str. 14, 10-718, Olsztyn, Poland. liliana_rytel@wp.pl.
2 Agri Plus sp. Z o.o, Marcelinska Str. 92, 60-324, Poznan, Poland.
3 Department of Clinical Physiology, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego Str. 13, 10-718, Olsztyn, Poland.