can travel medium distances at fast paces, requiring a balance between speed and endurance. Thoroughbreds may be bay, black, dark bay/brown, chestnut, gray, roan, white or palomino. Artificial insemination, cloning and embryo transfer are not allowed in the Thoroughbred breed. Standardbred The standardbred is a breed of horse used for a variety of purposes, but they are largely bred for harness racing. They are descended from thoroughbreds, morgans, and extinct breeds. Standardbreds are typically docile and easy to handle. They do not spook easily and are quite versatile in what they can do. They can be jumpers, dressage, and pleasure riding horses. Arabian horse The Arabian horse was developed by the Bedouin people of the Middle East specifically for stamina over long distances, so they could outrun their enemies. It was not until 1725 that the Arabian was introduced into the United States. Arabians appeared in the United States in colonial times, though were not bred as purebreds until about the time of the Civil War. Until the formation of the Arabian Horse Registry of America in 1908, Arabians were recorded with the Jockey Club in a separate subsection from Thoroughbreds. Arabians must be able to withstand traveling long distances at a moderate pace. They have an abundance of type I muscle fibers, enabling their muscles to work for extended periods of time. Also, the muscles of the Arabian are not nearly as massive as those of the Quarter Horse, which allow it to travel longer distances at quicker speeds. The Arabian is primarily used today in endurance racing but is also raced over traditional race tracks in many countries. Arabian Horse Racing is governed by the International Federation of Arabian Horse Racing. Quarter Horse The ancestors of the Quarter Horse were prevalent in America in the early 17th century. These horses were a blend of Colonial Spanish horses crossed with English horses that were brought over in the 1700s. The native horse and the English horse were bred together, resulting in a compact, muscular horse. At this time, they were mainly used for chores such as plowing and cattle work. The American Quarter Horse was not recognized as an official breed until the formation of the American Quarter Horse Association in 1940. In order to be successful in racing, Quarter Horses need to be able to propel themselves forward at extremely fast sprinter speed. The Quarter Horse has much