Hi all, sorry this is a bit of a long one. I came home from holidays to see my 11 month old colt trying to cover one of my mares. My neighbours mare in the next field was in season and he obviously felt the urge to hop on something, and with the fence in the way he hopped on my 2 year old filly, currently not in season. He didnt actually cover her, she is considerably bigger than him, but he was almost there so if left undisturbed i'm sure where theres a will theres a way. The problem I have is that I was unaware that all my horses were in the same field (broken fence)while I was away so for the past 3 weeks he could have been covering any of my mares. So obviously they have all been in season at one time or another over the past 3 weeks. The ones i'm concerned about are firstly his mother, then a 13 month old filly, and the 2 year old filly. I assume that the 2 year old is still too young to be covered, she is big and strong for a two year old but I wouldnt want her to come to any harm. What are peoples opinions on this? The yearling is definately way too young, i'm not even sure if she has begun cycling yet. (hopefully not). His mother absolutely cannot be allowed to carry a foal. None of my mares ever show when they are in season. I am hoping that if I get them scanned and pregnancy is detected, that it can be squeezed out as if it were a twin. If so, when is the best time to get them scanned? If they have to be 17 days or so to detect pregnancy, should I wait 17 days from today to scan them? If one of them was covered at the beginning of the 3 weeks waiting 17 days will bring then up to a potential 38 days. Would this cause a problem for pinching it out? thanks
Some two year-olds may be mature enough to carry a pregnancy, some not. There is no hard and fast rule.
Your simplest solution is to give prostaglandin at least 6 days after the affected mares went out of estrus (heat). This will cause them to come back into estrus and the pregnancy will be lost. Cheaper, easier and safer than trying to ultrasound an 18-month old! If you are unsure of when they went out of estrus, use two doses of prostaglandin 14 days apart.
You would probably be well advised to talk to your vet about this too - you will have to anyway to get the prostaglandin.
If the yearling has never been in estrus before, then using prostaglandin will not induce estrus. Prostaglandin causes the onset of estrus by destroying the CL, a structure that forms after an ovulation (this naturally occurs as part of the mare's cycle - giving prostaglandin simply changes the time that it occurs). If the filly has never had a cycle, and has therefore never ovulated, there will be no CL and estrus will therefore not be induced.
In the event that the filly has cycled and ovulated, then she herself is releasing prostaglandin on a regular basis, so introducing prostaglandin is not an abnormal occurrence.
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