Why do they call mares broodmare if a mare can have babies too?

Mares are female horses, and they can indeed have babies. The term "broodmare" is used specifically for mares that are used for breeding purposes. These mares are typically selected for their desirable traits, such as conformation, temperament, and athletic ability, and are used to produce offspring with similar qualities.

The term "broodmare" is used to distinguish these mares from those that are used for other purposes, such as riding, racing, or show. Broodmares are typically retired from active competition and are dedicated to producing foals. They may be bred to specific stallions to achieve desired genetic traits, and their offspring may go on to become successful in various equestrian disciplines.

Overall, the term "broodmare" is used to refer to mares that are specifically used for breeding purposes, while mares in general can have babies regardless of their breeding status.