Merck Manual

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Stage III parturition, fetal membranes at vulva, mare
Stage III parturition, fetal membranes at vulva, mare

Most of the time (~80%), the umbilical cord causes inversion of the chorioallantois so that the shiny gray surface of the allantois is on the outside of the expelled membranes. The amnion is seen between the allantois and the mare's tail. It is also normal for the red velvety chorion to be on the outside of the expelled membranes.

Courtesy of Dr. Patricia Sertich.

In these topics
Parturition in Horses