A palomino Quarter Horse shown at halter.

The American Quarter Horse is a breed of horse originally bred for sprinting short distances, typically races of a quarter mile or less. The Quarter Horse is the most popular breed in the United States, and the American Quarter Horse Association is the largest breed registry in the world, with over 3.2 million Quarter Horses registered worldwide.^[1] It has been clocked at 55 mph.^[2] The Quarter Horse is well known both as a race horse and for its performance in rodeos, horse shows and as a working ranch horse. The compact body of the Quarter Horse is well-suited to the intricate and speedy maneuvers required in calf roping, reining, cutting, working cow horse, barrel racing and other western riding events, especially those involving live cattle. The versatile Quarter Horse is also shown in English disciplines, driving, and many other equestrian activities. Image File history File linksMetadata Download high-resolution version (1634x1234, 1488 KB) Cavalo da raça Quarto de milha (Quarter Horse) em exposição na EMAPA (Avaré-SP-Brasil) Autor: José Reynaldo da Fonseca File links The following pages on the English Wikipedia link to this file (pages on other... Image File history File linksMetadata Download high-resolution version (1634x1234, 1488 KB) Cavalo da raça Quarto de milha (Quarter Horse) em exposição na EMAPA (Avaré-SP-Brasil) Autor: José Reynaldo da Fonseca File links The following pages on the English Wikipedia link to this file (pages on other... This page is just a list. ... Binomial name Equus caballus Linnaeus, 1758 The horse (Equus caballus, sometimes seen as a subspecies of the Wild Horse, Equus ferus caballus) is a large odd-toed ungulate mammal, one of ten modern species of the genus Equus. ... The American Quarter Horse Association (AQHA), based in Amarillo, Texas, is an international organization dedicated to the preservation, improvement and record-keeping of the American Quarter Horse, a breed of horses known throughout the globe for endurance, performance, conformation, and pedigree. ... It has been suggested that History of rodeo be merged into this article or section. ... A horse show is a judged exhibition of horses and ponies. ... It has been suggested that this article or section be merged with Ranching. ... Calf roping is a rodeo event that features a calf and a mounted cowboy. ... Reining is a Western horseback riding competition. ... Cutting is an equestrian event in the western riding style where a horse and rider are judged on their ability to separate a calf away from a cattle herd and keep it away for a short period of time. ... A professional barrel racer Barrel racing, is a rodeo event that features a horse or barrel racer and one rider, running a cloverleaf pattern around three barrels in a triangular arrangement. ... Western riding is shown in this sculpture, Great Western Tradition, by Doug Israelsen Western riding evolved from the cattle-working and warfare traditions brought to the Americas by the Spanish Conquistadors, and both equipment and riding style evolved to meet the working needs of the cowboy in the American West. ... English riding is a term used in the United States to describe a form of horseback riding that is seen throughout the world. ... Throughout history and before, there has been a huge number of types of horse-drawn vehicle. ... A young rider at a horse show in Australia. ...

Breed History

Colonial Era

In the 1600s, American colonists on the eastern seaboard began to cross imported English Thoroughbred horses with "native" horses such as the Chickasaw horse (a breed developed by Native American people from horses descended from Spanish, developed from Iberian, Arabian and Barb stock brought to what is now the Southeastern United States by the Conquistadors). Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ... The Chickasaws are a Native American people of the United States, originally from present-day Mississippi, now mostly living in Oklahoma. ... Native Americans are the indigenous peoples from the regions of North America now encompassed by the continental United States, including parts of Alaska. ... The Iberian horse is native to the Iberian peninsula. ... The Arabian horse is a breed of horse with a reputation for intelligence, high spirit, and outstanding stamina. ... Developed on the Barbary Coast of North Africa, the Barb is a desert horse, with great hardiness and stamina. ... Conquistador (Spanish: kōn-kē-stŏ-dōr) (meaning Conqueror in the Spanish language) is the term used to refer to the soldiers, explorers, and adventurers who brought much of the Americas and Asia Pacific under Spanish colonial rule between the 15th and 17th centuries, starting with the 1492 settlement...

One of the most famous of these early imports was Janus, a Thoroughbred who was the grandson of the Godolphin Arabian. He was foaled in 1746, and imported to colonial Virginia in 1756. The influence of Thoroughbreds like Janus contributed genes crucial to the development of the colonial "Quarter Miler," or "Quarter Mile Horse." This was a speedy working man's racer, sometimes referred to as the "Celebrated American Quarter Running Horse." The resulting horse was small, hardy, and quick, and was used as a work horse during the week and a race horse on the weekends.^[3] Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ... The Godolphin Arabian (ca 1724 - 1754), also known as the Godolphin Barb, was one of three horses which were the founders of the modern thoroughbred horse racing broodstock. ...

As flat racing became popular with the colonists, the Quarter Miler gained even more popularity as a sprinter over courses that, by necessity, were shorter than the classic racecourses of England, and were often no more than a straight stretch of road or flat piece of open land. When matched against a Thoroughbred, local sprinters often won. As the Thoroughbred breed became established in America, many colonial Quarter Mile mares were included in the original American stud books, starting a long association between the Thoroughbred breed and what would later become officially known as the "Quarter Horse," named after the distance at which it excelled. Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ...

Westward Expansion

In the 1800s, pioneers heading West needed a hardy, willing horse. On the Great Plains, settlers encountered horses that descended from the Spanish stock Hernán Cortés and other Conquistadors had introduced into the viceroyalty of New Spain, which today includes the Southwestern United States and Mexico. These horses of the west included herds of feral animals known as Mustangs, as well as horses domesticated by Native Americans, including the Comanche, Shoshoni and Nez Perce tribes. As the colonial Quarter Mile Horse was crossed with these western horses, the pioneers found that the new crossbred had innate "cow sense," a natural instinct for working with cattle, making it popular with cattlemen on ranches. The Great Plains covers much of the central United States, portions of Canada and Mexico. ... Hernán(do) Cortés Pizarro, 1st Marqués del Valle de Oaxaca (1485–December 2, 1547) was the conquistador who became famous for leading the military expedition that initiated the Spanish Conquest of Mexico. ... This does not adequately cite its references or sources. ... A feral horse (an American mustang) in Wyoming A feral animal or plant is one that has escaped from domestication and returned, partly or wholly, to its wild state. ... Free-roaming mustangs (Utah, 2005) Mustangs at the Palomino Valley Adoption Center A mustang is a hardy, free-roaming horse of the North American west, descended primarily from horses brought to the Americas by the Spanish conquistadores. ... A Hupa man. ... For other uses, see Comanche (disambiguation). ... Shoshone is a Native American language. ... The Nez Perce (pronounced ) are a tribe of Native Americans who live in the Pacific Northwest region (Columbia River Plateau) of the United States. ... It has been suggested that this article or section be merged with Ranching. ...

Development of the Quarter Horse as a distinct breed

Early foundation sires of Quarter horse type included Steel Dust, foaled 1843; Shiloh (or Old Shiloh), foaled 1844; Old Cold Dock (1862); Lock's Rondo, one of many "Rondo" horses, foaled in 1880; Old Billy -- again, one of many "Billy" horses -- foaled circa 1880; Traveler, shipped to Texas in 1889; and the Thoroughbred stallion Peter McCue, foaled 1895. ^{[4] [3]}

The main duty of the ranch horse in the American West was working cattle. Even after the invention of the automobile, horses were still irreplacable for handling livestock on the range. Thus, major Texas cattle ranches, such as the King Ranch, the 6666 (Four Sixes) Ranch, and the Waggoner Ranch played a significant role in the development of the modern American Quarter Horse. King Ranch logo - the running W brand King Ranch, located in south Texas between Corpus Christi, Texas and Brownsville, Texas, is one of the worlds largest ranches (larger than Rhode Island). ...

The skills needed by ranch hands and their horses became the foundation of the rodeo, a contest which began with informal competition between cowboys and expanded to become a major competitive event throughout the west. To this day, the Quarter Horse dominates the sport both in speed events and in competition that emphasizes the handling of live cattle. It has been suggested that History of rodeo be merged into this article or section. ... The classic vision of the American cowboy, as portrayed by Frederic Remington A cowboy (Spanish vaquero) tends cattle and horses on cattle ranches in North and South America. ...

However, sprint races were also popular weekend entertainment and racing became a source of economic gain for breeders as well. As a result, more Thoroughbred blood was added back into the developing Quarter horse breed. The Quarter Horse also benefitted from the addition of Arabian, Morgan and even Standardbred bloodlines. The Arabian horse is a breed of horse with a reputation for intelligence, high spirit, and outstanding stamina. ... The Morgan is one of the first horse breeds developed in the United States. ... Standardbred harness racing horses are so called because in the early years of the Trotting Registry, the standardbred stud book established in the United States in 1879 by the National Association of Trotting Horse Breeders, only horses who could race a mile in a standard time or better, or whose...

In 1940, the American Quarter Horse Association (AQHA) was formed by a group of horsemen and ranchers from the southwestern United States dedicated to preserving the pedigrees of their ranch horses. ^[5] The horse honored with the first registration number, P-1, was Wimpy,^[6] a descendant of the King Ranch foundation sire Old Sorrel. Other foundation sires alive at the founding of the AQHA and given the earliest registration numbers included King, Peppy, Leo, Joe Reed, Poco Bueno, Joe Hancock, and Three Bars (a Thoroughbred).^[7] Other Thoroughbred sires seen in early Quarter Horse pedigrees include King Plaudit, Blob, Top Deck, Vandy and Truckle Feature. The American Quarter Horse Association (AQHA), based in Amarillo, Texas, is an international organization dedicated to the preservation, improvement and record-keeping of the American Quarter Horse, a breed of horses known throughout the globe for endurance, performance, conformation, and pedigree. ... Wimpy could refer to: J. Wellington Wimpy a hamburger loving character from the Popeye cartoons. ... King Ranch logo - the running W brand King Ranch, located in south Texas between Corpus Christi, Texas and Brownsville, Texas, is one of the worlds largest ranches (larger than Rhode Island). ... Poco Bueno a bay quarter horse stallion foaled April 10, 1944. ...

"Appendix" and "Foundation" horses

Since the American Quarter Horse formally established itself as a breed, the AQHA stud book has remained open to additional Thoroughbred blood via a performance standard. An "Appendix" Quarter Horse is a first generation cross between a registered Thoroughbred and a Quarter Horse. The resulting offspring is registered in the "appendix" of the American Quarter Horse Association's studbook, hence the nickname. Horses listed in the appendix may be entered in competition, but offspring are not initially eligible for full AQHA registration. If the Appendix horse meets certain conformational criteria and is shown or raced successfully in sanctioned AQHA events, the horse can earn its way from the appendix into the permanent studbook, making its offspring eligible for AQHA registration. Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ...

Since American Quarter Horse/Thoroughbred crosses continue to enter the official registry of the American Quarter Horse breed, this creates a continual gene flow from the Thoroughbred breed into the American Quarter Horse breed, which has altered many of the characteristics that typified the breed in the early years of its formation. Some breeders, favoring the earlier style of horse, have created several separate organizations to promote and register "Foundation" Quarter Horses.^[8][9][10]

Open stud books are not uncommon: many Warmblood breeds admit horses of various bloodlines if they meet a conformational or performance standard; the Appaloosa has had an open registry to the Thoroughbred, Arabian and American Quarter Horse; the American Paint Horse has had an open registry to the American Quarter Horse, and the Criollo has had an open registry to the Chilean Horse. A newer breed, the Azteca, is a cross between the American Quarter Horse and Andalusian breeds, and still allows infusions from these sources. Warmbloods are a group of sport horse breeds and the term simply distinguishes this type of horse from the cold bloods (draft horses) and the hot bloods (Thoroughbreds and Arabians). ... An Appaloosa horse The Appaloosa is a horse breed with a color preference. ... Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ... The Arabian horse is a breed of horse with a reputation for intelligence, high spirit, and outstanding stamina. ... It has been suggested that Breeding Stock Paint be merged into this article or section. ... Criollo is a Spanish term (feminine criolla, plural criollos/criollas) which may refer to: The Criollos, a caste in the Spanish colonial caste system. ... Chilean Horse The Chilean Horse is a breed virtually unknown outside South America despite being the oldest registered native American breed, the oldest registered breed of Iberian origin, the oldest registered horse breed in South America and the oldest registered stock horse breed in the Western Hemisphere. ... Azteca may refer to: Azteca (Band), a Latin based rock band from the San Francisco Bay Area, United States. ... Andalusian horse The Andalusian horse or Spanish horse is one of the purest breeds of horses in the world today. ...

Quarter Horses Today

The Quarter Horse is well-suited for the western disciplines.

The American Quarter Horse is best-known today as a show horse, race horse, reining and cutting horse, rodeo competitor, ranch horse, and all-around family horse. Quarter horses dominate rodeo events such as barrel racing, calf roping and team roping; and gymkhana or O-Mok-See. ^[11] Other stock horse events such as cutting and reining are open to all breeds but also dominated by American Quarter Horse. Large purses allow top competitors to earn over a million dollars in some of these events. Image File history File linksMetadata Barrel_racing. ... Image File history File linksMetadata Barrel_racing. ... A horse show is a judged exhibition of horses and ponies. ... Horse-racing is an equestrian sporting activity which has been practiced over the centuries; the chariot races of Roman times were an early example, as was the contest of the steeds of the god Odin and the giant Hrungnir in Norse mythology. ... Reining is a Western horseback riding competition. ... Cutting is an equestrian event in the western riding style where a horse and rider are judged on their ability to separate a calf away from a cattle herd and keep it away for a short period of time. ... It has been suggested that History of rodeo be merged into this article or section. ... It has been suggested that this article or section be merged with Ranching. ... A professional barrel racer Barrel racing, is a rodeo event that features a horse or barrel racer and one rider, running a cloverleaf pattern around three barrels in a triangular arrangement. ... Calf roping is a rodeo event that features a calf and a mounted cowboy. ... Team roping also known as heading and heeling is a rodeo event that features a steer (typically a Corriente) and two mounted cowboys. ... Gymkhana is a term used in the United Kingdom, east coast of the United States, and other English-speaking nations to describe an equestrian event consisting of timed games for riders on horses. ... Cutting is an equestrian event in the western riding style where a horse and rider are judged on their ability to separate a calf away from a cattle herd and keep it away for a short period of time. ... Reining is a Western horseback riding competition. ...

The breed is not only well-suited for western riding and cattle work. Many race tracks offer Quarter Horses a wide assortment of pari-mutuel horse racing with purses in the millions. Quarter Horses have also been trained to compete in dressage and can be good jumpers. They are also used for recreational trail riding and in mounted police units. Western riding is shown in this sculpture, Great Western Tradition, by Doug Israelsen Western riding evolved from the cattle-working and warfare traditions brought to the Americas by the Spanish Conquistadors, and both equipment and riding style evolved to meet the working needs of the cowboy in the American West. ... Binomial name Bos taurus Linnaeus, 1758 Cattle (often called cows in vernacular and contemporary usage, or kye as the Scots plural of cou) are domesticated ungulates, a member of the subfamily Bovinae of the family Bovidae. ... Horse-racing is an equestrian sporting activity which has been practiced over the centuries; the chariot races of Roman times were an early example, as was the contest of the steeds of the god Odin and the giant Hrungnir in Norse mythology. ... An upper-level dressage competitor performing an extended trot Dressage (a French term meaning training) is a path and destination of competitive horse training, with competitions held at all levels from amateur to the Olympics. ... Show jumping is a form of competition in which horses are jumped over a course of fences, low walls, and other obstacles (e. ... Trail riding is riding on trails as opposed to riding on roads or courses. ... The Royal Canadian Mounted Police Musical Ride Mounted police are police who patrol on horseback. ...

The American Quarter Horse has also been exported worldwide. European nations such as Germany and Italy have imported large numbers of Quarter Horses. Next to the American Quarter Horse Association (which also encompasses Quarter Horses from Canada), the second largest registry of Quarter Horses is in Brazil, followed by Australia. ^[12] With the internationalization of the discipline of reining and its acceptance as one of the official seven events of the World Equestrian Games, there is a growing international interest in Quarter Horses. Countries like Japan, Switzerland and Israel that did not have traditional stock horse industries have begun to compete with American Quarter Horses in their own nations and internationally. The American Quarter Horse Association (AQHA), based in Amarillo, Texas, is an international organization dedicated to the preservation, improvement and record-keeping of the American Quarter Horse, a breed of horses known throughout the globe for endurance, performance, conformation, and pedigree. ... Reining is a Western horseback riding competition. ... The World Equestrian Games are the world championship for Equestrianism, administrered by the Fédération Equestre Internationale. ...

Breed Characteristics

A stock-type Quarter Horse

The modern American Quarter Horse has a small, short, refined head with a straight profile, and a strong, well-muscled body, featuring a broad chest and powerful, rounded hindquarters. They usually stand between 14 and 16 hands high, although some Halter-type horses may grow as tall as 17 hands. Download high resolution version (2368x3600, 867 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (2368x3600, 867 KB) Wikipedia does not have an article with this exact name. ... A hand (or handbreadth) is a unit of length measurement, usually based on the breadth of a male human hand and thus around 1 dm, i. ... A horse being shown at halter Halter is a term used to describe a type of horse show class where horses are shown in hand, meaning that they are led, not ridden, and are judged on their conformation and suitability as breeding stock. ...

There are two main body types: the stock type and the hunter or racing type. The stock horse type is shorter, more compact, stocky and well muscled, yet agile. The racing and hunter type Quarter Horses are somewhat taller and smoother muscled than the stock type, more closely resembling the Thoroughbred. Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ...

Stock type

Reining and cutting horses are on the small side, with quick, agile movement and very powerful hindquarters. Western pleasure show horses are often slightly taller, with smooth gaits, and a somewhat more level topline - though still featuring the powerful hindquarters characteristic of the Quarter Horse. Reining is a Western horseback riding competition. ... Cutting is an equestrian event in the western riding style where a horse and rider are judged on their ability to separate a calf away from a cattle herd and keep it away for a short period of time. ... Western Pleasure is an equestrian show event that tests a the suitability of the horse for appropriate gait cadence and speed, along with suitable disposition traits. ...

Horses shown in-hand in Halter competition are larger yet, with a very heavily muscled appearance, while retaining small heads with wide jowls and refined muzzles. A horse being shown at halter Halter is a term used to describe a type of horse show class where horses are shown in hand, meaning that they are led, not ridden, and are judged on their conformation and suitability as breeding stock. ...

Racing and hunter type

A quarter horse competing in an open hunter show.

Quarter Horse race horses are bred to sprint short distances ranging from 220 to 870 yards. Thus, they have long legs and are leaner than their stock type counterparts, but are still characterized by muscular hindquarters and powerful legs. Quarter horses race primarily against other Quarter horses, and their sprinting ability has earned them the nickname, "the world's fastest athlete." The show hunter type is slimmer, even more closely resembling a Thoroughbred, usually reflecting a higher percentage of appendix breeding. They are shown in hunter/jumper classes at both breed shows and in open USEF-rated horse show competition. Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... Horse-racing is an equestrian sporting activity which has been practiced over the centuries; the chariot races of Roman times were an early example, as was the contest of the steeds of the god Odin and the giant Hrungnir in Norse mythology. ... The show hunter is a type of show horse that is judged on its movement, manners, and way of going. ... Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ... The United States Equestrian Federation (USEF) is the national governing body for most equestrian sports in the United States, including dressage, driving, endurance riding, eventing, hunt seat equitation, hunter, jumper, paralympic, reining, roadster, saddleseat equitation, vaulting, and western riding. ... A horse show is a judged exhibition of horses and ponies. ...

Colors

Main article: Equine coat color

Quarter Horses come in nearly all colors. The most common color is sorrel, a brownish red, part of the color group called chestnut by most other breed registries. Other recognized colors include bay, black, "brown" (genetically a variation on bay), buckskin, palomino, gray, dun, red dun, grullo (also occasionally referred to as blue dun), red roan, blue roan, bay roan, perlino, and cremello.^[13] In the past, spotted or pinto colors were excluded, but now with the advent of DNA testing to verify parentage, the registry accepts all colors as long as parents are registered. Wild horses on the range, showing a wide range of coat colors Horses exhibit a diverse array of coat colors and distinctive markings. ... Sorrel is a coat color in horses, ranging from reddish-gold to deep burgundy. ... Chestnuts. ... Bay is a color of the hair coats of horses, characterized by a body color of dark red (known as blood bay) to deep brown, with black points (mane, tail, lower legs, and sometimes the muzzle and tip of the ears). ... Friesian horses are one of the best-known breeds of black-colored horse Black is a relatively uncommon coat color in horses, though not so unusual as to be considered rare. ... Buckskin New Forest pony A Buckskin Quarter Horse Mare Buckskin is a color of horses; it also refers to other things that are the color of a buckskin horse, such as the color of some breeds of dogs. ... Palomino is a coat color in horses, consisting of a gold coat and white or flaxen mane and tail. ... Gray is a coat color of horses, consisting of black skin, a white to dark gray coat, and a mane the same color or darker than the body coat. ... Dun coloring The dun gene is one of the dilution genes that affects both red and black pigments in a horses coat color. ... Grullo is a color of horses, characterized by smoky or mouse colored hairs on the body, often with shoulder and dorsal stripes and black barring on the lower legs. ... A red roan horse Roan is a type of coat color in horses (and, occasionally, in other animals, such as dogs and cattle) that is a mixture of white hairs with a base coat of another color. ... Perlino is a color in horses created by a dilution gene, also known as the creme gene acting on an underlying Bay coat color. ... Cremello is a color of horse consisting of a cream-colored body with a cream mane and tail. ... Pinto is a horse coloring that consists of large patches of white and another color. ... The structure of part of a DNA double helix Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living organisms. ...

Genetic Diseases

There are genetic diseases of concern to Quarter Horse breeders:

• Hyperkalemic periodic paralysis (HYPP), which is caused by an autosomal dominant gene linked to the stallion Impressive. It is characterized by uncontrollable muscle twitching and substantial muscle weakness or paralysis among affected horses. Because it is a dominant gene, only one parent has to have the gene for it to be transmitted to offspring. There is a DNA test for HYPP, the AQHA requires testing and is now limiting registration of some horses who possess the gene.^[14]
• Hereditary Equine Regional Dermal Asthenia (HERDA), also known as hyperelastosis cutis (HC). This is caused by a recessive gene, and thus, unlike HYPP, HERDA can only be transmitted if both parents carry the gene. When a horse has this disease, there is a collagen defect that results in the layers of skin not being held firmly together. Thus, when the horse is ridden under saddle or suffers trauma to the skin, the outer layer often splits or separates from the deeper layer, or it can tear off completely. It rarely heals without disfiguring scars. Sunburn can also be a concern. In dramatic cases, the skin can split along the back and even roll down the sides, with the horse literally being skinned alive. Most horses with HERDA are euthanized for humane reasons between the age of two and four years. The very hotly debated and controversial theory, put forth by researchers at Cornell University and Mississippi State University is that the sire line of the great foundation stallion Poco Bueno is implicated as the origin of the disease. There currently is no DNA test for HERDA, but active research is ongoing to try to pinpoint the gene.^[15] In 2006, researchers at the UC Davis School of Veterinary Medicine were able to localize a gene that may be responsible for HERDA, though a test has yet to be developed. ^[16]
• Glycogen Branching Enzyme Deficiency (GBED) is a genetic disease where the horse is lacking an enzyme necessary for storing glycogen, the horse's heart muscle and skeletal muscles cannot function, leading to rapid death. The disease occurs in foals who are homozygous for the lethal GBED allele, meaning both parents carry one copy of the gene. There is a DNA blood test for this gene.

• "Crop-out" Quarter Horses with Paint markings were not allowed to be registered for many years, it is also believed that some Quarter Horses may also carry the gene for Lethal White Syndrome. There is also a DNA test for this condition.

Hyperkalemic periodic paralysis (HYPP), also known as Impressive Syndrome, is an inherited autosomal dominant disorder which affects sodium channels in muscle cells and the ability to regulate potassium levels in the blood of horses. ... An autosome is a non-sex chromosome. ... In genetics, the term dominant gene refers to the allele that causes a phenotype that is seen in a heterozygous genotype. ... Impressive (4/15/1968 - 3/20/1995) is an Appendix American Quarter Horse with royal thoroughbred breeding on both sides. ... The American Quarter Horse Association (AQHA), based in Amarillo, Texas, is an international organization dedicated to the preservation, improvement and record-keeping of the American Quarter Horse, a breed of horses known throughout the globe for endurance, performance, conformation, and pedigree. ... Hereditary Equine Regional Dermal Asthenia (HERDA) aka hyperelastosis cutis (HC) is an inherited autosomal recessive connective tissue disorder. ... It has been suggested that this article or section be merged into Dominance relationship. ... Cornell University is a private university located in Ithaca, New York, USA. Its two medical campuses are in New York City and Education City, Qatar. ... Mississippi State University is a land-grant university located in north east-central Mississippi, United States, in the town of Starkville and is situated 125 miles northeast of Jackson and 23 miles west of Columbus. ... Poco Bueno a bay quarter horse stallion foaled April 10, 1944. ... The University of California, Davis, School of Veterinary Medicine, is the largest veterinary school in the nation. ... It has been suggested that this article or section be merged into Glycogen storage disease type IV. (Discuss) Glycogen Branching Enzyme Deficiency (GBED) is a genetic disease affecting horses, especially American Quarter Horses and related breeds. ... Electron micrograph of a section of a liver cell showing glycogen deposits as accumulations of electron dense particles (arrows). ... Homozygote cells are diploid or polyploid and have the same alleles at a locus (position) on homologous chromosomes. ... The structure of part of a DNA double helix Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living organisms. ... Lethal white syndrome (LWS) is a common genetic disorder primarily associated with American Paint Horses. ...

References

1. ^ AQHA Horse Statistics
2. ^ Iowa Quarter Horse Racing Association
3. ^ ^{a b} "Quarter Horses." Handbook of Texas Online, referenced May 30, 2006
4. ^ "Quarter Horse"
5. ^ American Quarter Horse Association
6. ^ [http://www.kyhorsepark.com/imh/bw/quar.html International Museum of the Horse: "American Quarter Horse"
7. ^ Foundation Quarter Horse Pedigrees
8. ^ [http://www.fqha.com/ Foundation Quarter Horse Association. Web site, accessed April 2, 2007
9. ^ Foundation Quarter Horses. Web site accessed April 2, 2007
10. ^ National Foundation Quarter Horse Association. Web site accessed April 2, 2007
11. ^ National Saddle Clubs Association
12. ^ The Canadian Quarter Horse Association
13. ^ AQHA General Glossary, defines all recognized coat colors
14. ^ [http://www.bringinglighttohypp.org/ Bringing light to HYPP
15. ^ HERDA
16. ^ Bannasch, Danika, White, Stephen, et. al. "Progress Toward Development of a DNA Test for HERDA, an Inherited Skin Disease." Genetics, Research Review, 2006, Center for Equine Health, University of California, Davis. Accessed January 13, 2007

• Denhardt, Robert Moorman. Foundation Sires of the American Quarter Horse, University of Oklahoma Press, 1997. ISBN 0-8061-2947-6

See also

• Thoroughbred
• American Paint Horse
• Azteca
• Quarab

Thoroughbred race horses The Thoroughbred is a horse breed best known as a race horse. ... It has been suggested that Breeding Stock Paint be merged into this article or section. ... Azteca may refer to: Azteca (Band), a Latin based rock band from the San Francisco Bay Area, United States. ... The Quarab is a cross between a American Quarter Horse and an Arabian. ...

External links

Wikimedia Commons has media related to:

American Quarter Horse

• American Quarter Horse Association
• http://www.american-quarter-horses.org/
• American Quarter Horse Breed Information
• Western Horseman Magazine
• Information about Quarter Horses in Europe
• {http://www.premierlonghorns.com Quarter Horses and Texas Longhorns]