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Uterine Health: Uterine Fluid Accumulation & Clearance

A major factor influencing the outcome of a pregnancy at the time of breeding is the presence or absence of fluid within the uterus. In normal, healthy mares fluid is absent within the uterus. A small amount of fluid may accumulate after breeding as part of the natural inflammatory response that occurs due to breeding. However, in the healthy mare this is resolved within 24 hours of breeding. Likewise, a small amount of lumen fluid (about 1 cm) may be seen due to the increased edema associated with estrus.

There are mares who have poor uterine clearance and accumulate fluid before/after breeding. These mares, if not treated, will have poor reproductive efficiency and will be prone to uterine infections. Thus mares should be monitored both prior to and following breeding for the presence of uterine fluid. If the fluid is managed (removed), these mares can be bred effectively and with greater success.

 

The following image shows deep endometrial folds with about 1 cm of fluid. This would be considered a normal edematous response …

1cmfluid

 

The following video clip shows minor fluid accumulation in a maiden mare …

 

The following image, however, not only shows deep folds with fluid accumulation, but this amount of fluid is indicative of poor uterine clearance. Although non-echogenic in nature, if left untreated, it will lower pregnancy rates …

pooruterineclearance

 

 

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