Merck Manual

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Retained fetal membranes, mare
retained-fetal-membranes-gross-sertich-sized
Retained fetal membranes, mare

    If fetal membranes are seen hanging from the vulva of a mare that foaled >3 hours prior, the mare is considered to have a retained placenta, or retained fetal membranes.

Courtesy of Dr. Patricia Sertich.