The Infinite Cat Project - Slide #1263: Rudasek - Added 6-20-06

One of the principal forms of horse racing, which is popular in many parts of the world, is thoroughbred racing. Harness racing is also popular in the eastern United States and more popular than thoroughbred racing in the United Kingdom and Canada. Quarter horse and Arabian racing are also popular in the western United States.
The breeding, training and racing of horses in many countries is now a significant economic activity as, to a greater extent, is the gambling industry which is largely supported by it. Exceptional horses can win millions of dollars and make millions more by providing stud services, such as horse breeding.
The style of racing, the distances and the type of events varies very much by the country in which the race is occurring, and many countries offer different types of horse races.
In the United States, races can occur on flat surfaces of either dirt or grass, generally thoroughbred racing; other tracks offer quarter horse racing and harness racing, or combinations of these three types of racing. Racing with other breeds, such as Arabian horse racing, is found on a limited basis. American thoroughbred races are run at a wide variety of distances, most commonly from 4.5 furlongs (905 m) to 11⁄2 miles (2414 m); with this in mind, breeders of thoroughbred race horses are able to breed horses to excel at a particular distance (see Dosage Index).
The high point of US horse racing has traditionally been the Kentucky Derby which, together with the Preakness Stakes and the Belmont Stakes, form the Triple Crown for three-year-olds. However, in recent years the Breeders' Cup races, held at the end of the year, have been challenging the Triple Crown events, held early in the year, as determiners of the three-year-old champion. They also have an important effect on the selection of other annual champions. The corresponding standard-bred event is the Breeders' Crown. There are also a Triple Crown of Harness Racing for Pacers and a Triple Crown of Harness Racing for Trotters.