Acompanhamento da dinâmica folicular em éguas mestiças da raça Quarto de Milha no município de Patos - PB.

Abstract

In the present study aimed to evaluate, through the ultrasonographic monitoring, the characteristics of ovarian dynamics in mares in order to determine the amount of follicular waves, and the number of follicles in each wave, and identify changes in vaginal cytologic pattern at each stage of the estrous cycle. There were four mares of Quarter Horses, adult and cyclical in the city of Patos-PB. three transrectal ultrasonographic examination was carried out in three days, in the period June-July 2016, a total of 10 for each mare. To evaluate the growth and measure the ovarian follicles, and identify the presence of corpora lutea in the ovaries. Follicles were counted and measured the diameters of the largest and the second largest follicle found during each sonographic evaluation. Three of the four evaluated mares had two follicular waves in 30-day evaluation. The diameter of ovulatory follicles found in this study were 45.5; 46.9 and 50.3 mm in mares 2, 3 and 4, respectively. Already the second largest follicle diameter (subordinate follicles) were 16.0; 19.0 and 29.5 mm in mares 2, 3 and 4, respectively, on the day of ovulation. It was observed that there was alternating between the left and right ovary in relation to the ovulatory follicle and dominant follicle. In all mares was possible to visualize the corpus luteum, despite the mare 5 does not ovulated. vaginal cytology examination was performed, however vaginal cytologic pattern showed no difference between estrogen and progesteronic stages in the cycle in mares evaluated in this study. Studies are needed with a larger number of animals in order to deepen the knowledge of other events involving ovarian follicular dynamics mare in the semiarid region of the Northeast.