(A) Percentages of viable spermatozoa showing high superoxide (O2-•) levels (E+/YO-PRO-1−), (B) mean E+ fluorescence intensity of viable spermatozoa showing high superoxide levels, (C) percentages of viable spermatozoa showing high peroxide (H2O2) levels (DCF+/PI−), and (D) mean DCF+ fluorescence intensity of viable spermatozoa showing high peroxide levels of semen samples treated with ethacrynic acid (EA), a glutathione S-transferases (GSTs) inhibitor, and the control group, assessed at different evaluation times during liquid storage at 17 °C (0, 24, 48, and 72 h). Different letters (a, b) indicate significant differences (p < 0.05) between treatments within storage time.