The average values RBC (6.23, 4.51 and 4.69), Hb (15.48, 11.44 and 11.18) and PCV (43.80, 33.50 and 32.10) were recorded from the non‐infected group, the infected group with protozoa and the infected group with ticks, respectively, which indicated the different degrees of anaemia. This evidence concerns the gene GSTM1 and anemia.