Relationship between estrus endometrial edema and progesterone production in pregnant mares two weeks after ovulation.
Authors: Grabowska Anna, Kozdrowski Roland
Journal: BMC veterinary research
Summary
# Editorial Summary: Endometrial Edema and Progesterone Levels in Early Equine Pregnancy Progesterone production is essential for maintaining pregnancy in mares until approximately 100–120 days gestation, when placental production takes over; understanding the relationship between early endometrial changes and progesterone secretion could help identify which mares may struggle with adequate hormone levels during this critical window. Grabowska and Kozdrowski measured serum progesterone concentrations at day 14 post-ovulation in pregnant mares and compared these values against ultrasound findings of peak estral endometrial oedema and intrauterine fluid (IUF) presence following artificial insemination, along with the number of treatments required to clear fluid and time to uterine clearance. The findings suggest that the degree of endometrial oedema observed during oestrus and the presence or persistence of IUF during early pregnancy may serve as practical ultrasonographic indicators of progesterone-producing capacity at this critical juncture. For practitioners managing mares post-insemination, this research implies that careful assessment of endometrial texture during oestrus and vigilant monitoring for fluid accumulation could help flag pregnancies potentially at risk from inadequate progesterone support, allowing for earlier intervention if necessary. These observations may prove particularly valuable for farriers and physiotherapists working alongside veterinary teams, as they highlight how reproductive ultrasound findings during breeding season can inform whole-horse management strategies during early gestation.
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Practical Takeaways
- •Monitoring endometrial edema and intrauterine fluid presence after AI may help predict progesterone adequacy for early pregnancy maintenance in mares
- •Understanding the relationship between uterine fluid clearance and progesterone production could guide treatment decisions for mares with post-insemination uterine pathology
- •Progesterone assessment at 14 days post-ovulation provides insight into early pregnancy viability and the effectiveness of treatments for intrauterine fluid
Key Findings
- •Progesterone concentration at 14 days post-ovulation was measured and correlated with estral endometrial edema severity in pregnant mares
- •Peak estral endometrial edema and presence of intrauterine fluid after artificial insemination were related to progesterone production patterns
- •The number of treatments required to clear intrauterine fluid and time to uterine clearance were associated with progesterone levels during early pregnancy