This work had as objective the evaluation of the leucogram in Holstein heifers and calves experimentally infected with a Venezuelan strain of Trypanosoma vivax. The dates were analysed by the Mann-Whitney non-parametric test. The total means comparation of leucocytes in heifers was statistically significative (P < 0.05). The calves produced a neutrophilia when compared the total means for the infected and control groups (P < 0.05). The totals means of linphocytes and monocytes were statistically significative (P < 0.05).
