Abstract
This study aimed to determine the histological features of the endometrium of bitches, as well as the cell proliferation at specific moments of diestrus, 10, 20, 30, 40, 50 and 60 days post ovulation, correlating the endometrial thickness with the uterine cell proliferation and the metabolic state (weight, blood glucose and plasma cholesterol) of the animals. Therefore, the right and left uterine horns of 26 clinically healthy bitches submitted to ovariohysterectomy were histologically analyzed 10, 20, 30, 40, 50 and 60 days post ovulation. The hematoxylin-eosin and AgNOR staining techniques were performed. All parameters were evaluated by ANOVA and post-hoc Tukey test (p<0.05). The correlation between endometrial thickness and uterine cell proliferation, weight, blood glucose and plasma cholesterol of animals was observed using the Pearson method (p<0.05). In the present study, it is concluded that endometrial thickness does not differ at any of the moments analyzed in diestrus. The endometrial thickness is not influenced by hormones, weight, blood glucose or serum cholesterol of bitches in this phase of the estrous cycle. However, there is greater cell proliferation in the endometrium at day 40 compared to day 60 post ovulation under the influence of the endocrine profile.
Highlights
The phases of the canine estrous cycle are divided into anestrus, proestrus, estrus and diestrus
Diestrus is the period of the estrous cycle in which the endometrium reaches its greatest thickness and cell density (Cruz 2011, Rehm et al 2007), and the endometrium is at its thickest at the start of diestrus (Cruz 2011)
This difference between studies is due to the fact that the first measurement of the endometrium in the present study was on the 10th day of ovulation and the difference found by Cruz (2011) was in the early days of diestrus, days 0 to 10; none of the bitches in the present study were within this period
Summary
The phases of the canine estrous cycle are divided into anestrus, proestrus, estrus and diestrus. The end of the characteristic behavior of estrus marks the beginning of diestrus. The greatest capacity of the corpus luteum in the production of P4 measured through concentrations in the peripheral blood (30-35 ng/ml) occurs between the 15th and 25th day post ovulation and gradually decreases to levels
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