I bought an 11 yr old miniature mare in the fall a few years ago. To my knowledge, she had never had a foal. None registered anyway and I don't really know her previous history.
I bred her the following spring, she got in foal and produced a live foal the next year (2007) at 13 years of age. I bred her back and she was late getting in foal. She aborted in January 08 at approx 90 days gestation. My vet flushed and infused her.
I bred her again in the spring, vet checked her in foal and my vet put her on weekly progesterone injections. She aborted sometime again around 90 - 100 days last fall. I was out of town at the time and was unaware until this spring when I determined that she was open.
I bred her again, vet checked her in foal at around 30 days and I decided to treat her with 14 days of SMZ's after reading that early abortions are likely caused by infections. She is now approximately 190 days gestation (11/13/09) and looks good.
My question is, should I give her another round (or 2) of antibiotics at this stage? Is there a likelihood that she would become infected again during the pregnancy?
I'm just really hoping that she maintains her pregnancy this time. Any information/suggestions you can give me will be greatly appreciated!
This is a little like asking "how long is a piece of string?"!
As you don't know the reason for the prior pregnancy losses, you cannot know if antibiotics are or are not assisting with the current one. Consequently, you cannot predict if there is a benefit by retreating.
FWIW early abortions may be highly correlated with uterine pathogenic presence, which is why we so strongly recommend performing the culture AND cytology (no use in a culture alone!) BUT systemic antibiotics will rarely cure a uterine infection, and antibiotics introduced into the uterus are typically required. It is therefore questionable whether your SMZ treatment was the cause for the pregnancy establishment in the first place... but then, who knows? As we have no diagnosed cause, we cannot rule out anything - including the fact that the sun set in the west that particular day!
Will giving your mare SMZ's help? Don't know. Will they harm? Probably not. A routine antibiotic treatment for mares with prior histories of placentitis is to treat for 1 week every month from about 4 months of pregnancy onwards. I can't really say anything other than that!
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