Follicular dynamics, ovarian vascularity and luteal development in mares with early or late postpartum ovulation

Follicular development and deviation processes during the postpartum period are not completely known in horses. Thus, we aimed to study the characteristics of follicular dynamics and ovarian vascular perfusion during the postpartum period in mares that demonstrated estrous behavior and had early ( 0...

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Published in:Theriogenology 2017-07, Vol.96, p.23-30
Main Authors: Lemes, Kleber Menegon, Silva, Luciano Andrade, Alonso, Maria Augusta, Celeghini, Eneiva Carla Carvalho, Pugliesi, Guilherme, Carvalho, Henrique Fulaneti, Affonso, Fernanda Jordão, Silva, Daniela Franco, Leite, Ticiano Guimarães, de Arruda, Rubens Paes
Format: Article
Language:English
Subjects:
Animals
Female
Horses - physiology
Ovary - blood supply
Ovary - physiology
Ovulation - physiology
Postpartum Period
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Summary:Follicular development and deviation processes during the postpartum period are not completely known in horses. Thus, we aimed to study the characteristics of follicular dynamics and ovarian vascular perfusion during the postpartum period in mares that demonstrated estrous behavior and had early ( 0.1) was detected between the groups when the data were normalized for the days preceding the first postpartum ovulation (from D-7 to D-1). However, when the data were normalized to days postpartum, the dominant follicle was larger (P 25 mm diameter was greater (P  0.1) was detected between groups in vascular perfusion of the dominant follicle or in the ovarian pedicle ipsilateral to the largest follicle. Similarly, no difference (P > 0.1) was detected in progesterone concentrations, corpus luteum (CL) area and vascular perfusion of the CL. Pregnancy rate did not differ (P > 0.1) between the early (3/3; 100%) and late (5/7; 71.4%) groups. Therefore, the characteristics of the follicle growth on the preceding days of ovulation were similar between the early- and late-ovulated mares and were consistent with the follicular dynamics expected in non-pregnant and non-lactating mares. However, when the data were analyzed for the days relative to parturition, greater follicle development was present in mares that ovulate earlier during the postpartum period (
ISSN:0093-691X
1879-3231
DOI:10.1016/j.theriogenology.2017.03.020