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The study aimed to evaluate synchronization and blood flow of the dominant follicle (DF) after estradiol cypionate (EC) or benzoate (EB) treatment. In experiment 1, progesterone (P4) implants (1.0g) were inserted in 45 heifers, which were given 1mL saline, 0.5mg EC or 2.0mg EB. The diameter of the DF and follicle emergence (FE) were recorded for 5 days. For experiment 2, 30 heifers were given: D0 (day 0): P4 implant and 2.0mg EB; D8: implant removal and 0.5mg of prostaglandin (cloprostenol). On D9, they were assigned in 1mL saline, 0.5mg EC or 1.0mg EB. From D8 to D10, the diameter and blood flow of the DF was monitored. Data were analyzed by ANOVA or Kruskal-Wallis test, and compared by Tukey (5%). In experiment 1, the FE occurred later (P 0.05) between groups (80.0, 70.0 and 55.5%, EB, EC and saline). The interpretation was that, in these concentrations, the EB, at the beginning, delayed FE and, at the end of the protocol, promoted a better synchrony of the DF, confirmed by the increase of the blood flow.

Sincronização folicular e vascularização do folículo dominante em novilhas mestiças tratadas com estradiol