Wiktionary
brood mare
alt. A stud mare, a female horse used for breeding. n. A stud mare, a female horse used for breeding.
Usage examples of "brood mare".
She was another mare, a brood mare this time for the High King’.
She was another mare, a brood mare this time for the High King's stud service, hopefully to provide a royal son.
If I wanted only a brood mare to get me sons, God knows I could have had enough of them!
Tarleton had a brood mare and a colt and was as happy as though she had a million dollars.