Efeito do tratamento com estradiol no útero de éguas com folículo pré-ovulatório e edema uterino baixo ou ausente

Abstract

Hormonal treatments in cyclic and acyclic waters are widely used so that more products are generated during the year. In addition, key methods have been achieved to circumvent regulations that are detrimental to your fertility. Endometrial edema is related to estrogen levels and, according to recent studies, is also associated with fertility and increased pregnancy rates. The objective is to evaluate the effect of treatment with estrogen, 17β estradiol, on a low or absent edema in mares that have a preovulatory follicle, in addition to the interference of this hormone on ovulation. Mares were also assessed for progesterone levels, which included assessment of cervix elongation and absence of remaining corpus luteum confirmed by ultrasonography. Eight animals and 39 estrus were evaluated during 6 months. The animals that presented pre-ovulatory follicles and low or absent edema entered the treatment group and were administered 0.7 to 1mg of 17β estradiol, in addition to the evaluation of the cervix and the presence or absence of a remaining corpus luteum. The treated animal was evaluated the following day, and in the presence of moderate to high edema (2 and 3), an ovulation inducer was administered 24 after edema detection and followed up until ovulation. In cases where low edema was observed, the animal still received the inducer so that ovulation could be controlled. Of the 39 evaluated estros, 20% fit the requirements mentioned above; of this total, 50% responded positively to the treatment with increased edema. All treated animals were induced and ovulated, with the exception of one whose ovulation had already occurred prior to the application of the inducer. The occurrence of ovulation showed variations between 2 and 4 days after treatment and induction, from 0 to 2 days. In short, it is concluded that as half of the waters responded to the treatment, other individual and environmental factors may be causes of interference in this result. Since this is a preliminary study, future experiments are needed to better understand the possible interfering factors in the treatment with 17β estradiol on low or absent endometrial edema.