EN
The goal of the studies was evaluation of the influence of some parameters of cellular immunity on age and anatomo-pathological lesions in the bison. The results of the studies show an influence of the state of health of the bison as measured in a system of assessing points for various gross pathological lesions, on an importent cellular immunity parameter (reactions level of lymphocytes to mitogen (PHA). The better the ability to mobilize lymphocytes the better the health condition of the bison was found to be (lower amount of anatomopathological points). At the same time a higher mobility of lymphocytes was found in older animals. Results of hematological tests. Which showed higher total lymphocyte and leucocyte numbers (per 1 mm³ of blood) also suggest, a better effectiveness of the immunologic system in older animals.