LOUISVILLE, Ky. (AP) — 2011 Horse of the Year Havre de Grace has been retired after injuring an ankle following a workout at Churchill Downs.Owner Rick Porter says Monday on his Fox Hill Farm website that the injury was detected in the champion filly's right front ankle Sunday. After she was examined at Rood and Riddle Equine Hospital "we didn't get a positive prognosis for continuing her racing career."Havre de Grace (HA'-vur-duh-grays) won the New Orleans Ladies in her only start this year. Last year, she took Horse of the Year honors by winning five of seven races, including the Apple Blossom, the Woodward Stakes against males, and the Beldame. She also finished fourth in the Breeders' Cup Classic.The 5-year-old Havre de Grace won nine of 17 starts and earned $2,586,175.