Discovery was also the broodmare sire of leading sire Bold Ruler. His daughters have also made him a noteworthy broodmare sire. Easy Goer has also been an influential broodmare sire. A broodmare is a mare used for breeding. Retired to broodmare duty, Lady Pitt produced nine foals. He was the Leading broodmare sire of 1962 and 1964. The chestnut horse was sired by English Derby winner Blenheim, out of the broodmare Dustwhirl. In recent years, Ghostzapper has also found success as a broodmare sire. When racing, his low-headed, efficient gait was reminiscent of his broodmare sire, Secretariat. He is remembered as one of the better broodmare sires. In 1992, Secretariat was the leading broodmare sire in North America. His broodmare herd consists of more than 50 mares. In her first eight years as a broodmare, Spilletta produced only one live foal. They hoped she would become a good broodmare, as she had a promising pedigree. And Declare was bred by Paul Lanskey, the owner of the broodmare, Geblitzt.