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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)
Term twin foals of different colors.
Shipley C (2006)
Uncommon outcome of a twin pregnancy in mares: two live foals. They tend to be smaller and do not thrive.
Pozor MA (2009)
Live twins at term. This is not a common occurrence.
Live twins at term. This is not a common result.
Aligning the lips with the teat.
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.
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.
This macerating, decomposing fetus was delivered at term, at the same time as a normal live twin.
Roberts SJ (1972)
This mummy was delivered as a twin to a normal foal at term.
This normal foal was born twin to a mummy.
Third trimester twin foal in the process of mummifying.
LeBlanc MM (1982)
Twin foals aborted during the late second trimester of gestation. The foal on the left is in the process of mummification.
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