Objective.

The objective of the work was evaluate the damage genetic caused by the use of ivermectin (IVM) in cows zebu to concentrations of 1% and 3.15% through the test comet.

Material and methods.

15 cows, were taken with age between 3 and 4 years old, average weight of 350 kg, body condition between 3 and 3.5. Three experimental groups with five animals per group, which were exposed to the concentration of IVM to 1% to 3.15% more group control (without application of IVM) were used. Animal blood sample was performed by venipuncture jugular or medial flow with vacutainer® needle, extracting 8 ml of blood. The blood samples it was collected at 9, 18 and 27 days post-treatment.

Results.

The display of the comets is made by using fluorescence microscope, the cells were evaluated by means of visual log and the Comet image software. Evidenced the presence of nuclei with DNA migration in all analyzed plates. The values of classification of comets indicate cells with high levels of damage (grade 3: cells with high damage). The rate of DNA damage of the treatment to 1% to 3.15% was significant, to relate to the control group.

Conclusions.

The results obtained in this study demonstrate the likely genotoxic potential of the use of IVM in cattle.

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