 In the world's major Thoroughbred racing countries, breeding of racehorses is a huge industry providing over a million jobs worldwide.While the attention of horseracing fans and the media is focused almost exclusively on the horse's performance on the racetrack or for male horses, possibly its success as a sire, little publicity is given to the brood mares.Such is the case of La Troienne, one of the most important mares of the 20th century to whom many of the greatest Thoroughbred champions, and dams of champions can be traced.