My 8 year mare who has had 3 foals previously double ovulated when we last bred her (standardbred trotter, AI). At 16 days had her ultrasounded. Vet "was pretty certain" that she had 2 pregnancies...2 vesicles...both in same horn. He tried to separate with ultrasound wand but was unable to separate due to the vesicles being conjoined (he thought). At 27 days ultrasound indicated two heartbeats...with one being "normal" & "strong" and the other "weak." We left things alone hoping that nature would take care of the weaker one (as my research indicated would be the likely result). Question, if at the next ultrasound, at 51 days there are still 2 heartbeats...what are my options, ie, should we try to reduce to one...or just abort both. Obviously, if we abort both I have lost the breeding season...or do we just leave it alone and check again at 70 days or so....thanks for any advice!
Our article about twinning should prove of value to you (follow that link to get to it).
By 50+ days your options are limited. You can attempt a single reduction using cranio-cervical dislocation or intra-cardiac injection, but either of those are comparatively specialised and you will need to go to a Veterinary University or a veterinarian specialising in equine reproduction to get it done. Note too that resolution to singleton is not 100%. The other alternative is repeated doses of Prostaglandin F2α over the course of several days, which will reduce both pregnancies with luck (you definitely don't want to try and take a twin pregnancy to term), but is probably going to leave you with a mare that is unbreedable again until next year as she is unlikely to return to estrus before the end of the breeding season (unless you are prepared for a very late foal).
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