Cells from goat's milli and peripheral blood taken during the lactation per
iod were analysed by flow cytometry.. The investigated cells were populatio
ns of leucocytes lymphocyte subpopulations (T,T-helper, T-cytotoxic, B, WC1
-N2) and all MHC class II positive cells. Labelling of cells was performed
on whole blood and milk cell suspensions. Statistically significant differe
nces were found between percentages of B and WC1-N2 lymphocytes and MHC II
positive cells from peripheral blood during the lactation period and all of
examined milli cells during the same time.