What does the appearance of a "red bag" during birth in a mare indicate?

The appearance of a "red bag" during the birthing process in a mare signifies a protrusion of the chorioallantois, which represents an emergency situation. This structure is the outer membrane surrounding the fetus and contains fluid. When it appears during labor, it suggests that the placenta is separating from the uterine wall too early, leading to potential complications for the foal.

If the chorioallantois is not resolved promptly, it can result in severe oxygen deprivation to the foal, which can lead to stillbirth or other serious health issues. Recognizing this emergency allows for immediate intervention to ensure the foal receives the necessary assistance for delivery and care. Addressing this situation quickly can be crucial for the survival and health of the foal.