Effect of the Estrus Expression on Follicular and Luteal Morphofunctional Characteristics and Fertility in Bos indicus females Synchronized for FTAI

Background: Recent studies have been conducted with the aim of improving fertility rates in FTAI programs beef females. The observation estrus expression constitutes an important indicator zebu Therefore, this work has as objective to evaluate impact on follicular, luteal and morphofunctional characteristics Nelore females synchronized for FTAI.Materials, Methods & Results: Sixty five lactating female (Bos taurus indicus) were used. On a random day, denominated day 0 (D0), 65 received progesterone-releasing device associated application 2.0 mg estradiol benzoate intramuscularly (IM). D9, intravaginal devices removed was administered 500 μg cloprostenol sodium IM; 0.6 cypionate IM 300 UI Equine Chorionic Gonadotropin IM. At point, animals marked marking stick determination expression. D11 synchronization protocol, characterized two groups: without (WO/ ESTRUS) (W/ ESTRUS). evaluation follicle diameter (FOLD), wall area (FOLA), vascularization (FOLV) percentage preovulatory (%FOLV) using B-mode ultrasonography color Doppler then artificial inseminations performed. corpus luteum (CLD), total (CLA), (CLV), (% CLV) collection blood serum levels progesterone carried out D24. analysis concentration performed by chemiluminescence method Access immunoassay systems Progesterone, sensitivity 0.1 ng/mL. diagnosis gestation transrectal D45. WITH ESTRUS group presented superior FOLD, FOLA, FOV (P < 0.05) averages those cows WITHOUT group. In relation characteristics, exhibited CLD, CLA, CLV P4 significantly higher than However, bovines % similar As rates, there difference between experimental groups ESTRUS.Discussion: present demonstrated follicular morphological parameters, therefore accordance other studies. These authors show estradiol, which is directly related sperm transport reproductive tract, oocyte maturation fertilization affecting submitted program. Similarly, interrelation corroborating findings some researches, where verified parameters conception that behavior FTAI. detection can be used tool direct matings protocols, promoting identification probability conception, owing better hemodynamic conditions.