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During Roman times the Gauls and other Europeans used horses of the heavy, northern type for pulling loads and other work. In the Middle Ages huge draft animals, over 16 hands (64 in./160 cm) high, were bred to carry armored knights as well as their own armor. As cavalry warfare declined, such medieval inventions as the horseshoe and the rigid horse-collar (see harness) made draft horses more useful for work. By the 19th cent. the draft horse had replaced the ox in N Europe and North America. Draft breeds common in the United States were the Belgian, the Clydesdale, the Percheron; and the Shire, also the most common draft horse in England. Horses are trained to be ridden or driven in many different sporting events and competitions. Examples include horse shows, gymkhana and O-Mok-See, rodeos, endurance riding, fox hunting, and Olympic-level events such as three-day eventing, combined driving, dressage, and show jumping. Although scoring varies by event, most emphasize the horse's speed, maneuverability, obedience and/or precision. Sometimes the equitation, the style and ability of the rider, is also considered. For centuries horses have been one of the most economically important domesticated animals, especially relied upon for farmwork and for transportation. Their importance declined following the introduction of mechanization. The history of the horse is prominent in religion, mythology, art, transportation, agriculture, and warfare. Sports such as polo and horseball do not judge the horse itself, but rather use the horse as a partner for human competitors as a necessary part of the game. Although the horse assists this process and requires specialized training to do so, the details of its performance are not judged, only the result of the rider's actions -- be it getting a ball through a goal or some other achievement. Examples of these sports of partnership between human and animal also include jousting (reenacting the skills used by medieval knights), where the main goal is for one rider to dismount the other, and buzkashi, a team game played throughout Central Asia, the aim being to capture a goat carcass while on horseback. All horses move naturally with four basic gaits: the four-beat walk, the two-beat trot or jog, and the leaping gaits known as the canter or lope (a three-beat gait), and the gallop. Besides these basic gaits, some horses perform a two-beat pace, instead of the trot. In addition, there are several four-beat "ambling" gaits that are approximately the speed of a trot or pace, though smoother to ride. These include the lateral slow gait, rack, running walk, and tölt as well as the diagonal fox trot. Ambling gaits are often genetic traits in specific breeds, often referred to as gaited horses. In most cases, gaited horses replace the standard trot, a 2-beat gait, with one of the four beat gaits.
Sports such as polo and horseball do not judge the horse itself, but rather use the horse as a partner for human competitors as a necessary part of the game. Although the horse assists this process and requires specialized training to do so, the details of its performance are not judged, only the result of the rider's actions -- be it getting a ball through a goal or some other achievement. Examples of these sports of partnership between human and animal also include jousting (reenacting the skills used by medieval knights), where the main goal is for one rider to dismount the other, and buzkashi, a team game played throughout Central Asia, the aim being to capture a goat carcass while on horseback.
The horse (Equus caballus) is a large odd-toed ungulate mammal, one of ten living species of the family Equidae. The following terminology is used to describe horses of various ages: The English-speaking world measures the height of horses in hands, abbreviated "h" or "hh," and is measured at the highest point of an animal's withers. One hand is . Intermediate heights are defined by hands and inches, rounding to the lower measurement in hands, followed by a decimal point and the number of additional inches between 1 and 3. Thus a horse described as 15.2 hh tall, means it is 15 hands, 2 inches, or in height. It is thought that the largest horse in (recorded) history was a Shire horse named Sampson, who lived during the late 1800s. He stood 21.2˝ hands high and his peak weight was estimated at . The current record holder for the world's smallest horse is Thumbelina, a fully mature miniature horse affected by dwarfism. She is tall and weighs . Regardless of a horse's actual birthdate, for most competition purposes, horses are considered a year older on January 1 of each year in the northern hemisphere and August 1 in the southern hemisphere. The exception is endurance riding, where the minimum age to compete is based on the horse's actual calendar age. A very rough estimate of a horse's age can be made from looking at its teeth. The most widely known use of horses for sport is horse racing, seen in almost every nation in the world. There are three types: "flat" racing; steeplechasing, i.e. racing over jumps; and harness racing, where horses trot or pace while pulling a driver in a small, light cart known as a sulky. Most race horses in the developed world are Thoroughbreds, a breed which can reach speeds up to . In the case of a specialized sprinting breed, the American Quarter Horse, speeds over have been clocked. In harness racing, performed by Standardbred horses, speeds over have been measured. A major part of the economic importance of horse racing, as for many sports, lies in the gambling associated with it. Gelding: a castrated male horse of any age, though for convenience sake, many people also refer to a young gelding under the age of four as a "colt."
Mare: a female horse four years old and older. Most horses perform work such as carrying humans or are harnessed to pull objects such as carts or plows. Hundreds of distinct horse breeds have been developed, allowing horses to be specialized for certain tasks; lighter horses for racing or riding, heavier horses for farming and other tasks requiring pulling power. Some horses, such as the miniature horse, can be kept as pets. In some societies, horses are a source of food, both meat and milk; in others it is taboo to consume these products. In industrialized countries, horses are predominantly kept for leisure and sporting pursuits, while in other parts of the world they are still used as working animals.