This is a Special Edition. In this book the Author shows the 2012 Top 10 Sires and what made them stand out above the others and why The book tells you about the large heart horses with an extensive list of the horses that carry the large (Xh) gene and how having them in the right position in your horse's pedigree can improve your chance of producing the great runner that could be a Triple Crown contender The author also shows you tell-tale signs in a horse's conformation that carry the large heart gene. Showing the look in mares that are single copy or double copy mares and the signs seen in large heart stallions. The large heart in horses can make them have the stamina to go the distance and excel over the other horses. Showing how combining the large heart gene horses, with the sire line nicks, the female family nicks, balancing your pedigree for speed and stamina and breeding for the best balanced conformation traits and soundness, can give your horses a real edge in the racing world.