New to board but hope to keep this as simple as possible. I had a mare US on day 24-26/ vet stated a twin within one sack ? ( like a women has identical twins) not one in each horn, also stated double placenta-saw the pix and it appeared to have two circles within a larger one and two "placentas" with a twist to them-or at least that is what and how it was explained to me. Decision made to abort and retry. When discussing this w/ the breeder he stated that an embryo has what appears to be a double placenta but actually isnt. Stated that when it develops to 40 days the "other placenta" shrinks and the main one takes hold??? Please help, I dont quite know what to think here. My current vet has been pretty good so far. Any pictures out there or descriptions as to what the developing baby is to look like exact at each stage of the game. thanks Susan
There are, unfortunately, some inherent errors if that is indeed what your veterinarian told you...
While one should "never say never" (so I won't! ), twins in the equine are almost universally as a result of a double ovulation. There have only been three or four recorded cases of true "identical twins", so the chances of your mare having identical twins is extremely unlikely!
Next problem... placentation does not start to occur in the equine until about day 60 of pregnancy! In other words, there was no placenta present at day 26-40 to comment on, even though a comment was apparently made!!! What is present at that stage is the yolk sac and latterly the allantoic sac (the yolk sac regresses) - very different structures from the placenta!
We have an article on early embryology in the equine which should assist somewhat in your understanding as it has pictures. In re-reading your post, I suspect that the breeder is closer to the mark in what [s]he is saying - it's still not a placenta, but the embryo starts out with the yolk sac, and that yolk sac regresses while at the same time the allantoic sac increases in size. They are not placentae, but there is an increase/decrease situation. If that was what was seen, and there was no other evidence of twins (i.e. two embryos visible), then you may well have had a perfectly normal singleton pregnancy...
Finally, the one good piece of news - aborting the pregnancies was probably the correct decision at that stage if there were twins (a fact about which I am not convinced...). To pre-empt a reoccurrence, you might want to review the article on the site about twin pregnancies - forewarned is forearmed!
Well, I hope this is how you add to the original post. Jos, after reading your explaination I am just sick..the so called placenta looked like white ladders...one circle slightly behind the other one. My gut told me to get the printout and I didnt. Hard lesson learned. mare is being rebred now and will definitely get an exact on this next one even if it is second opinion if he states same as before. makes one want to go to school to learn there own. thanx for your help susan
But sometimes you have to make a decision based on the information that you have. Perhaps you can print out the articles Jos gave you and present them to the Vet... At least if everyone can learn from this then not all has been lost.
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