Churchill Downs Churchill Downs Churchill Downs, located on Central Avenue in south Louisville, Kentucky, United States, is a Thoroughbred racetrack most famous for annually hosting the Kentucky Derby. It officially opened in 1875, and held the first Kentucky Derby and the first Kentucky Oaks in the same year. Churchill Downs has also hosted the renowned Breeders' Cup on nine occasions, most recently on November 2 and 3, 2018. Churchill Downs Incorporated owns and operates the racetrack. With the infield open for the Kentucky Derby, the capacity of Churchill Downs is roughly 170,000. In 2009, the Horseplayers Association of North America introduced a
American Quarter Horse hence the nickname. Horses listed in the appendix may be entered in competition, but offspring are not initially eligible for full AQHA registration. If the Appendix horse meets certain conformational criteria and is shown or raced successfully in sanctioned AQHA events, the horse can earn its way from the appendix into the permanent studbook, making its offspring eligible for AQHA registration. Since Quarter Horse/Thoroughbred crosses continue to enter the official registry of the American Quarter Horse breed, this creates a continual gene flow from the Thoroughbred breed into the American Quarter Horse breed, which has altered many of the characteristics