1 Department of Clinical Physiology, Faculty of Veterinary Medicine University of Warmia and Mazury in Olsztyn, ul Oczapowskiego 13, 10-718, Olsztyn, Poland. krystyna.makowska@uwm.edu.pl.
2 Department of Clinical Physiology, Faculty of Veterinary Medicine University of Warmia and Mazury in Olsztyn, ul Oczapowskiego 13, 10-718, Olsztyn, Poland.