La Troienne Stakes in 2007, Louisville Stakes in 2008 and Louisville Distaff Stakes in 2009. In 2010 the race was renamed after the famous broodmare La Troienne. La Troienne Stakes The La Troienne Stakes is a Grade I American Thoroughbred horse race for fillies and mares, age four and older, over a distance of miles held at Churchill Downs in Louisville, Kentucky. It is on the same day as the Kentucky Oaks, on the day before the Kentucky Derby (which is held on the first Saturday in May) . The current purse is $300,000. This race was upgraded to a Grade I for
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