Twin Pregnancies in Horses Flashcards
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| Question | Answer | Article | |
| How do most twin pregnancies originate? | From multiple ovulations, i.e. dizygotic
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| Why does twinning cause abortion? | An equine pregnancy requires the surface area of the entire uterus for placentation for one foal. If it is shared then it is inadequate to maintain a pregnancy.
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| What happens if twin pregnancies implant in the same uterine horn? | 75% naturally reduce to a singleton, the other 25% will develop and most likely abort without intervention.
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| What breeds conceive twins most commonly? |
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| When do horses with twin pregnancies usually abort? | In the third trimester: 7-9 months of gestation.
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| When should mares be scanned for twins? |
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| Why should mares be scanned before breeding? | To identify and map any endometrial cysts so that they do not confuse pregnancy diagnosis.
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| What is the most common method of reduction of a twin? | Manual manipulation of one conceptus to the end of a uterine horn and pressure applied to crush the vesicle. This should be done prior to 30 days of gestation to secure the best chance for the remaining foetus.
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