Typically there are two methods used for ovariectomy of mares. One is a flank incision which is most commonly performed as a standing surgery, is usually the more expensive of the techniques, but typically carries less risk to the mare; the other is a colpotomy where the ovaries are removed through an incision made next to the cervix in the vagina. This too is a standing surgery, is typically considerably cheaper, but does carry more risk to the mare.
Depending upon the need for sterilization, there may be chemical techniques available such as immunization against GnRH or even the use of progestins to suppress estrus. Those techniques are reversible (unlike ovariectomy of course) but if used in the long term will be likely to end up costing a lot.
One point to consider: Many people want to ovariectomize their mares because the mares are demonstrating persistent estrus which is causing problems (e.g. in the show ring). Be aware of the fact that the ovaries are the producers of the hormone that prevents estrus display (progesterone), so removal will not suppress estrus, but may even in some circumstances result in persistent displays! Tease mares on large breeding farms used in semen collection are often ovariectomized so that they remain persistently in heat.
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