Has anyone had to keep their mares on Progesterone treatment for the entire pregnancy? Have mare that I was giving two week shot to that was late in her pregnancy. I was three days late in giving her a shot and she aborted. She immediately came into heat. Would three days late cause an abortion? This mare has had late term absorptions, so I just planned to keep her on the progesterone for the entire pregnancy. This is the longest pregnancy she has held. So now I wonder if the abortion was caused by the late shot or if she has other additional issues causing the abortions.
Progesterone levels should be bottomed out by about day 210 of pregnancy and undergoing a gradual reduction to that point from about 90 days onwards. Therefore, testing progesterone levels later in pregnancy is absolutely a waste of time!
Generally, among reproduction specialists, it is agreed that the use of progestin supplementation in mid to late pregnancy is not valid with the exception of situations where there is a known problem such as a compromised cervix or placentitis. The trouble is that in the event that it is recommended that the mare be taken off it, and she then aborts, everyone immediately points the finger at the person who said "take the mare off it"!!! It is extremely unlikely that the two are linked, but people always tend to think they are! If there was another associated problem (such as placentitis) then possibly the stopping of the progestin may have had an impact, but it is also quite possible that the same thing would have happened even if the mare were not on the progestin.
BTW - there is no such thing as a "late term absorbtion". ALL pregnancies are lost through the cervix, not absorbed. that applies to early pregnancy losses as well as later. In the early pregnancy loss situation, the chances of finding the small amount of tissue involved is minimal. In later term loss, more likely. The chances are though, that if the mare is being kept inside or a small paddock, and the aborted fetus is not being found, she is losing the pregnancy at different time from that which you suppose. If kept outside, then loss of the aborted fetus to predators is likely.
Bottom line - as one of my reproduction associates says: "If you sleep better at night with the mare on a progestin, then put the mare on it. 11 months is a long time not to sleep well!!!"
My apologies, but here is the long version. This mare must have some abnormal problem such as the ones you mentioned. The mare is 16 years old and she was around six months when she aborted this last fetus. This mare very easily gets pregnant but will not carry it. She did have a couple of foals prior to having this probelm (and prior to us owning her), but for the last three years we have come up empty handed. The first couple of years she had mid term abortions with no fetus found. We did flush an embryo out of her last year that did not hold in the recipient. Prior to flushing the embryo, she had had a two week pregnancy abort. The vet said nothing about any cervical irregularities at that time and everything looked good as far as what an ultrasound can tell in the reproductive tract. FINAL CHAPTER- I was and am not interested in putting any more 'vet money' into this mare until a friend of mine who works for a ranch with 'unlimited vet funds' told me that he was giving this shot every two weeks to at least nine mares a year and not had it fail. I thought it was worth a try to keep her on it full term as it very inexpensive compared to regumate and I was feeling lucky that week. I also had a vet friend who had a mare that she had to keep on regumate the entire pregancy. She had three late term abortions and then two full term babies after the 11 month progesterone treatment. So again my sincerest apologies for the length of this post and one question. Is it normal for a mare that has aborted to come in heat the next day?
No apologies needed! I asked how far along she was because many people feel that 90 days is considered safe in foal. Many mares do need the extra hormonal help in this first trimester. It can seem like a long time when giving Regumate every day.
Did you follow with ultra sounds to determine a heart beat or to insure she held the pregnancy as long as you thought? She could have held 90 days and then not come back into estrus for the other 90 days. She may have just been coming into a heat when you missed the shot.
At age 16, there can be a number of things that cause problems. A caslick may help, and a uterine biopsy may give you more information. She has had full term foals, so maybe all is not lost.
We found a normal looking foal for its age, and she came into full blown heat the very next day.
Posted From: 126.96.36.199
Posted on Saturday, April 30, 2005 - 08:51 pm:
HI I am foal watching and I came across this site HOW Cool On the Requmate it is expensive and you have to watch handling it!!!!!! We send some of our mares to Kentucky to be foal out and be bred back and everyone of them come back on Regumate and I have the progestrone levels done on them and they are good but we keep them on it and check blood around 120 days if they are close to 4 we keep them on the requmate, so far everything has worked out.
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