Check Broodmare’s History for Risk of Posterior Presentation

When foals are born, the normal presentation is with the forelegs extended and the head and neck stretched along the legs. A posterior position, in which the hind legs are presented first, is sometimes difficult and dangerous for the mare and foal.

Foals presented in posterior position face problems such as a prolonged labor, fractured ribs, malpositioned limbs, and an increased incidence of fluid inhalation. This uncommon presentation is estimated to occur in fewer than 0.2% of equine births.

A study conducted in England found evidence that mares with a posterior birth may repeat this presentation in successive pregnancies. In the early months of pregnancy, the fetus can assume any position and change its orientation without great difficulty. However, in the later months, restricted space makes it more difficult to turn completely around in the uterus.

An ultrasound examination can show the orientation of the fetus as the mare approaches her foaling date, and mares found to be carrying a fetus in the posterior position can be monitored so that a veterinarian can intervene if necessary. For mares that are at increased risk of a posterior delivery because of their history, owners should talk to a veterinarian about attending the birth and/or planning a Caesarian delivery to prevent a difficult delivery and the possible death of the foal.