The study was carried out on 4200 turkey broilers Big 6, from which after a 3- week breeding an experimental group was separated. The group was receiving an addition of bioplex-Cu 0.5g/L of drinking water till the end of the experiment. The haematological and biochemical factors were examined in the 8th week of the turkeys life, in blood taken from the wing vein of 10 randomly chosen birds (5 cocks and 5 hens) from both experimental and control group. In the obtained samples, Ht, total protein level, a-NH2 nitrogen, glucose, and the Cu, Fe, Zn and Ca level were determined. Also, in the bioplex-Cu and in the feeds used, Cu, Fe, Zn and Ca were determined by the spectrophotometry of atom absorption method after dry mineralization. The applied bioplex-Cu statistically significantly increased the haematocrit and glucose level. The addition of Cu also caused an increase in the concentration of this element in the plasma of turkey blood. The significantly increased Cu level did not cause interaction with other components of the feed and did not disturb the Fe, Zn and Ca absorption to the turkey blood.