EFICIÊNCIA REPRODUTIVA DE NOVILHAS GIROLANDO PÚBERES E PRÉ-PÚBERES SUBMETIDAS A PROTOCOLO DE INSEMINAÇÃO ARTIFICIAL EM TEMPO fIXO

Abstract

The objective of this study was to evaluate the effect of ovulation synchronization protocol on follicular dynamics and ovulation rate of Girolando prepubertal heifers. The experiment was conducted in Caturité- PB were used 37 heifers, of which 12 were prepubertal. The heifers, were followed ovulation synchronization protocol, and we collected data of follicular dynamics and ovulation time. Sonographic examinations were performed every 12 hours from the implant removal to ovulation for evaluation of follicular dynamics. For evaluation of the follicles, ultrasound examinations were performed with the removal of the intravaginal device (D8) at the time of TAI (D10). It was observed that the diameter of the follicle removal of the device in pubertal and prepubertal heifers were respectively 7.04 ± 0.4 mm 6.6 ± 1,0mm. Furthermore, the maximum diameter of follicle pubertal heifers was 11.5 ± 0.94 mm and in prepubertal heifers was 9.2 ± 0.1 mm, the interval pickup P4 / ovulation in heifers was pubescent 86.4 ± 5.9 hours, which did not occur in prepubertal heifers because ovulation has not occurred in this group. It is concluded that prepubertal and did not respond to ovulation synchronization protocol due to lack of ovulation.