A permanent, indelible mark on the inside of the upper lip used to identify the horse. In Quarter Horses the letter/number combination is five numbers or four numbers ending in a letter. In Thoroughbreds, it is a letter followed by five numbers.
The most important race for 3-year-old fillies took place at Churchill Downs on May 3 and Horsephotos.com was there to catch all the action. Look below and enjoy the sights and scenes from this year's Oaks, won by Princess of Sylmar.