Resumo
The objective of this work was to evaluate the effect of the association of the antioxidant resveratrol with sucrose in a vitrification protocol of ovarian tissue in cows, on the morphology of preantral follicles. Ten ovaries of cows were used, collected in local slaughterhouses, fragmented and distributed to the following treatments: fresh control (Co); toxicity (T); (T0) zero toxicity/ only with base vitrification solution (SBV), (TS) toxicity with SBV plus sucrose, (TR) toxicity with SBV plus resveratrol, (TS+R) toxicity with SBV and sucrose plus resveratrol; and for glazing (V); (VS) vitrification with SBV and sucrose, (VR) vitrification with SBV and resveratrol, (VS+R) vitrification with SBV and sucrose plus resveratrol. Preantral follicles were quantified and classified according to morphology into normal and degenerated. The mean percentages between normal and degenerated follicles did not differ (p>0.05) in the following percentages, normal 51.4% and degenerated 48.60%. In the toxicity test there was a difference (p0.05), demonstrating that the vitrification technique is efficient, but the concentration of cryoprotectants used needs to be re-evaluated. Concluding that the natural antioxidant association resveratrol to sucrose in vitrification and rewarming protocols contributes with reservations for the morphological preservation of preantral follicles in cows.