Originally Posted by .Delete.
I seriously hope your mare is in good condition to have a foal. Her age scares me. There are alot of heal risks breeding a mare of that age.
actually this statement is incorrect. There are minimal health risks with breeding an older mare as long as she is not a maiden. The more often/regularly she was bred, the easier it will be for an older mare to carry to term without issue. Of course the mare must be in good health and weight for this to hold true. There are risks, yes, however many of them cause the mare not to carry to term and abort early on which is nature's way of saying her body is not able to carry this baby. Here's some great reading: The Horse | Breeding the Older Mare Beyond that first 40 days, mares of all ages are at some risk of abortion due to a number of infectious and non-infectious causes such as twins, herpes virus, fescue toxicosis, etc. The older mare, in particular, is more susceptible to ascending uterine infections due to potential cervical incompetency and/or poor external conformation.
I thought it was interesting to read that infection seems to be the highest cause of abortions in older mares and that it can be relatively well managed to prevent this.
Also just as interesting was that overbreeding caused as many risks as underbreeding. By that I mean a mare that has produced a foal nearly every year will have uterine stretching, while a mare that has never produced and is a maiden in her late teens will have as many risks for the converse reasons. Ideally mares (intended as broodmares) should be bred every other year with a year off in between babies. Some breeders do 2 years bred, one year off which is also acceptable from what I have read.
All that said - I know none of this really applies to the OP as this was not an intentional breeding. However should you choose to keep the baby (if the mare is pregnant) I wanted to share as that is a great article!