What are sterile mare horses?

Answer 1

They are quite rare and are still just called mares, or sometimes spayed mares. Because of the difficulty (and danger) of performing major abdominal surgery on such a large animal, mares that are deliberately sterilised because of hormonal imbalances or for another reason (such as to stop breeding) are usually spayed with a laparoscope. A small cut is made in each side, often under local anaesthetic, and the ovaries are removed but the uterus left in place.