The Visual Guide to
Equine Reproduction
- Parturition
- Presentation
- Injuries to the Foal
- Cesarean Section
- Fetotomy
- Twinning
- Prolapsed Uterus
- Prolapsed Rectum
Obstetrics: Twinning
Premature Twins.
Premature twins aborted at 8 to 9 months of gestation. The incidence of double ovulations in Thoroughbred mares is ~ 20 per cent. Less than 10 per cent of twin pregnancies result in two live foals.
Drost M (1971)
Live Term Twins.
Uncommon outcome of a twin pregnancy in mares: two live foals. They tend to be smaller and do not thrive.
Pozor MA (2009)
Term Twins Born Alive.
Live twins at term. This is not a common occurrence.
Shipley C (2006)
Term Twins Born Alive.
Live twins at term. This is not a common result.
Shipley C (2006)
Twin Fetal Membranes.
Allantoic side out. Apposing portions of the respective allantoic portions of the feetal membranes of the twins are devoid of villi and appear pink in the illustration.
Shipley C (2006)
Twin Fetal Membranes.
Allantoic side out. Apposing portions of the respective allantoic portions of the twin fetal membranes are devoid of villi and appear pink in the illustration.
Shipley C (2006)
Macerating Twin.
This macerating, decomposing fetus was delivered at term, at the same time as a normal live twin.
Roberts SJ (1972)
Mummy, Twin to Normal Foal.
This mummy was delivered as a twin to a normal foal at term.
Utrecht (1976)
Normal Foal, Twin to Mummy.
This normal foal was born twin to a mummy.
Utrecht (1976)
Twin Mummy.
Third trimester twin foal in the process of mummifying.
LeBlanc MM (1982)
Aborted Third Trimester Twins.
Twin foals aborted during the late second trimester of gestation. The foal on the left is in the process of mummification.
LeBlanc MM (1982)