Mares can only have one foal a year (twins generally aren't much good and everybody knows it). Stallions can have dozens, nay, hundreds, and the fee is up front, before the foal is born, comes up with a birth defect, been stepped on my his mom, kicked by a pasture-mate, or anything else that makes it less saleable. A single mare, even a great race mare, just doesn't have the value in the breeding business that the guys do.
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