This is quite a long story and has been an on going topic on another forum but I have been advised to post on here as there are alot more experienced people here.
My mare went to stud in May she was covered twice the last date being the 15th May, I have to add up until this point my mare had cycled regulary and every month had come into season. 20 days later we had her scanned, she hadnt returned in season so we thought things were looking good but unfortunately the vet said she wasnt in foal. 10 days later she still hadnt returned in season so we had her scanned again, a different vet this time and he said the same she is not in foal.
My mare up until this point wasnt the easiest of mares to scan needing double sedation and still extremely tense inside making it difficult to look around.
The second vet advised I put her on a short 14 day course of regumate and inject her with Prostaglandin to bring her in, he seemed to think that she wasnt producing big enough follicles in order to ovulate.
So we did this and 7 days after the course she returned in season and was covered 3 times last date being 11th July, I decided to bring her home and have her scanned here.
20 days from last covering I had her scanned in foal, I have to mention at this point too the vet kept asking if this was 20 days, she said she would come back in 10 days time just to take she was holding as she wasnt happy with the shape she said it wasnt as round as it should be.
She scanned again still in foal but by this time she thought she had detected twins, I can only describe it as a small sac inside the embryo, only one clear visible heartbeat and the other sac was completely empty she said she was quite sure there was only one but since I needed her out 6 days later for vaccinations she said she would bring her scanner and just double check for me.
So I have her out again this time she is certain there are twins and sees two visible heartbeats, she doesnt feel experienced enough to seperate as its quite unusual it appears they are completely ontop of each other and attached.
A more experienced vet came out the following day to examine her, by this stage the foetus should be roughly 37 days, well when he looked he said it was really bizarre he didnt beleive the foetus to be this young it was so well developed. He had a really good look found what appeared to be the sac attached inside but could only see one heartbeat again he said it could be if the foetus was conceived from the first covering which would make it at this stage roughly 93 days old, that it could be just be where it is growing and changing shape.
So anyway by this stage im even more confused than ever, im still not 100% sure I dont have twins and now face the possibilty of the foal being older than expected. This is my first time breeding I might add, I have been trying to do my own research and find explanantions. I asked the vet why then at 20 days was no heartbeat visible he said its possible the other vet because she thought it was only 20days had no reason to go looking for a heartbeat.
I wanted to know why if she conceived the first time did the prostaglandin not abort the foal, I have since learnt that the foetus would of been about 41 days by the time she was injected and by this stage the endometrial cups would have also formed. The vet told me the injection doesnt always work in aborting either.
I had the vet today to scan again as he wanted to double check for twins as the other vet was sure she had seen 2 heartbeats, he said something about its possible she was looking at it from an angle where it was showing the same heartbeat from a funny angle and had she of known she was looking at an older foetus she might not have thought it was twins.
Well today still only one foetus, could only see one heartbeat, he felt alot hapier that it had all come together and appeared neater, the sac that was causing the confusion was no longer visible, however he couldnt get as clear picture as last time it had moved position so it was harder for him to be certain how old it was.
He took a picture for me anyway and for any of you experts maybe you can make more sense of this than I can, this picture is either of a 41 day or 97 day foetus