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American Quarter Horse

From Wikipedia, the free encyclopedia

American Quarter Horse
Quarter Horse(REFON)-cleaned.jpg
A palomino American Quarter Horse shown at halter
Other namesQuarter Horse
Country of originUnited States
Traits
Distinguishing featuresGreat speed over short distances; short, refined head; strong, well-muscled body, featuring a broad chest and powerful, rounded hindquarters
Breed standards

The American Quarter Horse, or Quarter Horse, is an American breed of horse that excels at sprinting short distances. Its name is derived from its ability to outrun other horse breeds in races of a quarter mile or less; some have been clocked at speeds up to 55 mph (88.5 km/h). The development of the Quarter Horse traces to the 1600s.

The American Quarter Horse is the most popular breed in the United States today, and the American Quarter Horse Association is the largest breed registry in the world, with almost 3 million living American Quarter Horses registered in 2014.[1] The American 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 American Quarter Horse is well-suited for the intricate and quick maneuvers required in reining, cutting, working cow horse, barrel racing, calf roping, and other western riding events, especially those involving live cattle. The American Quarter Horse is also used in English disciplines, driving, show jumping, dressage, hunting, and many other equestrian activities.

Breed history

Colonial era

In the 1600s on the Eastern seaboard of what today is the United States began to breed imported English Thoroughbred horses with assorted "native" horses.[2]

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.[3] The influence of Thoroughbreds like Janus contributed genes crucial to the development of the colonial "Quarter Horse".[4][5] The resulting horse was small, hardy, quick, and was used as a work horse during the week and a race horse on the weekends.[6]

As flat racing became popular with the colonists, the Quarter Horse gained even more popularity as a sprinter over courses that, by necessity, were shorter than the classic racecourses of England. These courses were often no more than a straight stretch of road or flat piece of open land. When competing against a Thoroughbred, local sprinters often won.[citation needed] As the Thoroughbred breed became established in America, many colonial Quarter Horses were included in the original American stud books.[7] This began a long association between the Thoroughbred breed and what would later become officially known as the "Quarter Horse", named after the 14 mile (0.40 km) race distance at which it excelled.[8][9] Some Quarter Horses have been clocked at up to 55 mph.[10]

Westward expansion

In the 19th century, 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.

The 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.[11][12] As the colonial Quarter 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.[13]

Development as a distinct breed

A photograph of Peter McCue, taken in Oklahoma around 1905
A photograph of Peter McCue, taken in Oklahoma around 1905

Early foundation sires of Quarter horse type included Steel Dust, foaled 1843; Shiloh (or Old Shiloh), foaled 1844; Old Cold Deck (1862); Lock's Rondo, one of many "Rondo" horses, foaled in 1880; Old Billy—again, one of many "Billy" horses—foaled circa 1880; Traveler, a stallion of unknown breeding, known to have been in Texas by 1889;[14] and Peter McCue, foaled 1895, registered as a Thoroughbred but of disputed pedigree.[6][14][15] Another early foundation sire for the breed was Copperbottom, foaled in 1828, who tracks his lineage through the Byerley Turk, a foundation sire of the Thoroughbred horse breed.[16][17][18][19]

The main duty of the ranch horse in the American West was working cattle. Even after the invention of the automobile, horses were still irreplaceable 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 Quarter Horse. The skills required by cowboys 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 in events that require speed as well as the ability to handle cattle.[20]

Sprint races were also popular weekend entertainment and racing became a source of economic gain for breeders. As a result, more Thoroughbred blood was added into the developing American Quarter Horse breed. The American Quarter Horse also benefitted from the addition of Arabian, Morgan, and even Standardbred bloodlines.[21]

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.[22] After winning the 1941 Fort Worth Exposition and Fat Stock Show grand champion stallion, the horse honored with the first registration number, P-1, was Wimpy,[23] a descendant of the King Ranch foundation sire Old Sorrel. Other sires alive at the founding of the AQHA were given the earliest registration numbers Joe Reed P-3, Chief P-5, Oklahoma Star P-6, Cowboy P-12, and Waggoner's Rainy Day P-13.[24] The Thoroughbred race horse Three Bars, alive in the early years of the AQHA, is recognized by the American Quarter Horse Hall of Fame as one of the significant foundation sires for the Quarter Horse breed.[25] Other significant Thoroughbred sires seen in early AQHA pedigrees include Rocket Bar, Top Deck and Depth Charge.[26]

"Appendix" and "Foundation" horses

Since the American Quarter Horse was formally established as a breed, the AQHA stud book has remained open to additional Thoroughbred blood via a performance standard. An "Appendix" American Quarter Horse is a first generation cross between a registered Thoroughbred and an American Quarter Horse or a cross between a "numbered" American Quarter Horse and an "appendix" American 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.[27]

Since 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 argue that the continued addition of Thoroughbred bloodlines are beginning to compromise the integrity of the breed standard. Some favor the earlier style of horse and have created several separate organizations to promote and register "Foundation" Quarter Horses.[28][29][30]

American Quarter Horses today

The Quarter Horse is well-suited for the western disciplines.
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 are commonly used in rodeo events such as barrel racing, calf roping and team roping;[31][32] and gymkhana or O-Mok-See.[33] Other stock horse events such as cutting and reining are open to all breeds but are dominated by American Quarter Horse.

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 earnings in the millions.[32] Quarter Horses have also been trained to compete in dressage and show jumping. They are also used for recreational trail riding and in mounted police units.[23]

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.[34] In the UK the breed is also becoming very popular, especially with the two Western riding Associations, the Western Horse Association and The Western Equestrian Society. The British American Quarter Horse breed society is the AQHA-UK.[citation needed] 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. The American Quarter Horse is the most popular breed in the United States today, and the American Quarter Horse Association is the largest breed registry in the world, with nearly 3 million American Quarter Horses registered worldwide in 2014.[35]

Breed characteristics

A halter-type Quarter Horse
A halter-type Quarter Horse

The 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 (56 and 64 inches, 142 and 163 cm) high, although some Halter-type and English hunter-type horses may grow as tall as 17 hands (68 inches, 173 cm).

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.[36]

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, buckskin, palomino, gray, dun, red dun, grullo (also occasionally referred to as blue dun), red roan, blue roan, bay roan, perlino, cremello, and white.[37] In the past, spotted color patterns were excluded, but now with the advent of DNA testing to verify parentage, the registry accepts all colors as long as both parents are registered.[38]

Stock type

A stock horse is a horse of a type that is well suited for working with livestock, particularly cattle. Reining and cutting horses are smaller in stature, with quick, agile movements and very powerful hindquarters. Western pleasure show horses are often slightly taller, with slower movements, smoother gaits, and a somewhat more level topline – though still featuring the powerful hindquarters characteristic of the Quarter Horse.[citation needed]

Halter type

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. There is controversy amongst owners, breeder and veterinarians regarding the health effects of the extreme muscle mass that is currently fashionable in the specialized halter horse, which typically is 15.2 to 16 hands (62 to 64 inches, 157 to 163 cm) and weighs in at over 1,200 pounds (540 kg) when fitted for halter competition. Not only are there concerns about the weight to frame ratio on the horse's skeletal system, but the massive build is also linked to hyperkalemic periodic paralysis (HYPP) in descendants of the stallion Impressive (see Genetic diseases below).

Racing and hunter type

A Quarter Horse warming up for hunt seat competition
A Quarter Horse warming up for hunt seat competition

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."[39] 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.[40]

Genetic diseases

There are several 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,[41] only one parent has to have the gene for it to be transmitted to offspring. There is a DNA test for HYPP, which is required by the AQHA. Since 2007, the AQHA bars registration of horses who possess the homozygous form (H/H) of the gene, and though heterozygous (H/N) horses are still eligible for registration, altering that status is currently being discussed. Additionally all Quarter Horses born 2007 or later that are confirmed to be descendants of Impressive must carry a note about the risks of HYPP on their registration papers. Due to HYPP, the halter classes are undergoing significant changes. Halter classes are dominated by the Impressive bloodline. Impressive, a very prolific halter horse, brought to the stock breeds the muscle mass that is popular in halter competition today. This muscle mass is linked to HYPP, and as the condition is reduced within the breed, the style of horse in halter classes is also likely to change. Already there have been rule changes, including the creation of a "Performance Halter class" in which a horse must possess a Register of Merit in performance or racing before it can compete.[42]
  • Malignant hyperthermia. A causative mutated allele, ryanodine receptor 1 gene (RyR1) at nucleotide C7360G, generating a R2454G amino acid substitution.[43] has been identified in the American Quarter Horse and breeds with Quarter Horse ancestry, inherited as an autosomal dominant[44][45] It can be caused by overwork, anesthesia, or stress.[46]
  • Hereditary Equine Regional Dermal Asthenia (HERDA), also known as hyperelastosis cutis (HC). This is caused by an autosomal 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. As of May 9, 2007, Researchers working independently at Cornell University and at the University of California, Davis announced that a DNA test for HERDA has been developed. Over 1,500 horses were tested during the development phase of the test, which is now available to the general public through both institutions.[47]
  • 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. The stallion King P-234 has been linked to this disease. There is a DNA blood test for this gene.[48]
  • Equine polysaccharide storage myopathy, also called EPSM or PSSM, is a metabolic muscular condition in horses that causes tying up, and is also related to a glycogen storage disorder.[49] While also seen in some draft horse breeds, PSSM has been traced to three specific but undisclosed bloodlines in Quarter Horses, with an autosomal recessive inheritance pattern.[50] 48% of Quarter Horses with symptoms of neuromuscular disease have PSSM. To some extent it can be diet controlled with specialized low-starch diets, but genetic testing is advised before breeding, as the condition exists at a subclinical level in approximately 6% of the general Quarter Horse population.[51]
  • Lethal White Syndrome. Although "cropout" Quarter Horses with Paint markings were not allowed to be registered for many years, the gene for such markings is a recessive and continued to periodically appear in Quarter Horse foals. Thus, it is believed that some Quarter Horses may carry the gene for Lethal White Syndrome. There is a DNA test for this condition.[52]
  • Cleft Palate Birth defect, this is not just a genetic disorder. There is not just one thing that will cause this issue. It can be caused from genetics, hormones, mineral deficiency, tranquilizers, or steroids. Cleft palates are extremely uncommon. The surgery to repair the cleft palate does not have a high success rate. Only about a 20% success rate is seen from the surgery. Quarter horses seem to have the most research done with them, and this defect occurs more in quarter horses based on the research. Some observations of a horse with a cleft palate and no surgery are: lifting head high when eating, dropping head low to drink, coughing when beginning of exercise, and placing wormers or other oral medications in the side of the jaw and taking about hour to administer full dose.[53][54]

See also

References

  1. ^ "AQHA Annual Report - 2014 Horse Statistics". American Quarter Horse Association. Archived from the original on September 23, 2015. Retrieved August 24, 2015.
  2. ^ Denhardt Quarter Running Horse pp. 4–8
  3. ^ Denhardt Quarter Running Horse pp. 20–32
  4. ^ Mackay-Smith Colonial Quarter Race Horse p. 106
  5. ^ Mackay-Smith Colonial Quarter Race Horse p. 138
  6. ^ a b Beckmann, Bruce. "Quarter Horses". Handbook of Texas Online. Texas State Historical Association. Retrieved 2006-05-30.
  7. ^ Mackay-Smith Colonial Quarter Race Horse p. xxxi
  8. ^ "American Quarter Horse." Britannica School. Encyclopædia Britannica, Inc., 2015. Web. 1 Jul. 2015.
  9. ^ Dutson, Judith (2012), Storey's Illustrated Guide to 96 Horse Breeds of North America, Storey Publishing, p. 64, ISBN 9781603429184
  10. ^ Iowa Quarter Horse Racing Association. "Iowa Quarter Horse Racing Association 1976–2008". IQHRA Website. Iowa Quarter Horse Racing Association. Archived from the original on 7 June 2008. Retrieved 2008-06-11.
  11. ^ Moulton, Gary E., ed. (2003). The Lewis and Clark Journals. Lincoln, Nebraska: University of Nebraska Press. ISBN 978-0-8032-8039-7.
  12. ^ Murphy, Robert F., and Yolanda Murphy. Shoshone-Bannock Subsistence and Society. Good Press, 2019.
  13. ^ Mackay-Smith Colonial Quarter Race Horse p. 193
  14. ^ a b Close, Legends 2: Outstanding Quarter Horse Stallions and Mares.
  15. ^ Oklahoma State University. "Quarter Horse". Breeds of Livestock. Oklahoma State University. Archived from the original on 22 June 2008. Retrieved 2008-06-11.
  16. ^ "Copperbottom" (PDF). Archived from the original (PDF) on 2019-10-26. Retrieved 2019-10-26.
  17. ^ Lost Bloodline
  18. ^ Sir Archy
  19. ^ History of the Quarter Horse
  20. ^ Doan, Ryan; Cohen, Noah D; Sawyer, Jason; Ghaffari, Noushin; Johnson, Charlie D; Dindot, Scott V (2012). "Whole-Genome sequencing and genetic variant analysis of a quarter Horse mare". BMC Genomics. 13: 78. doi:10.1186/1471-2164-13-78. PMC 3309927. PMID 22340285.
  21. ^ "Breeds of Livestock - Quarter Horse — Breeds of Livestock, Department of Animal Science". afs.okstate.edu.
  22. ^ Denhardt Quarter Horse pp. 143–167
  23. ^ a b Kentucky Horse Park. "American Quarter Horse". International Museum of the Horse- Horse Breeds of the World. Kentucky Horse Park. Archived from the original on 2010-08-22. Retrieved 2008-06-11.
  24. ^ American Quarter Horse Association Combined Stud Book 1-2-3-4-5 p. 1
  25. ^ "Three Bars (TB)" (PDF). American Quarter Horse Association. Archived from the original (PDF) on 2011-07-07. Retrieved 2010-12-21.
  26. ^ Wiggins Great American Speedhorse p. 166
  27. ^ "Documents and Forms". American Quarter Horse Association. www.aqha.com. Retrieved August 24, 2019.
  28. ^ Foundation Quarter Horse Association. "Foundation Quarter Horse Association". FQHA Website. Foundation Quarter Horse Association. Archived from the original on 1 April 2007. Retrieved 2007-04-02.
  29. ^ Foundation Horses. "Foundation Bred Quarter Horses". FoundationHorses.com. Foundation Horses. Archived from the original on 26 April 2007. Retrieved 2007-04-02.
  30. ^ National Foundation Quarter Horse Association. "National Foundation Quarter Horse Association". NFQHA Website. National Foundation Quarter Horse Association. Archived from the original on 22 April 2007. Retrieved 2007-04-02.
  31. ^ Ross, Michael W; Dyson, Sue J (2010-11-11). Diagnosis and Management of Lameness in the Horse - E-Book. ISBN 978-1437711769.
  32. ^ a b Lynghaug, Fran (2009-10-15). The Official Horse Breeds Standards Guide: The Complete Guide to the Standards of All North American Equine Breed Associations. ISBN 9781616731717.
  33. ^ "National Saddle Clubs Association - Home". www.omoksee.com.
  34. ^ "The Canadian Quarter Horse Association".
  35. ^ "AQHA Annual Report - 2014 Horse Statistics". American Quarter Horse Association. Archived from the original on September 23, 2015. Retrieved August 24, 2015.
  36. ^ "Light Horse: Breed Types and Uses" (PDF). Alabama Horse Council. 2011. Archived from the original (PDF) on August 19, 2019. Retrieved September 9, 2019.
  37. ^ "Registration rules" (PDF). American Quarter Horse Association. Archived from the original (PDF) on 2011-07-07. Retrieved 2010-12-21.
  38. ^ American Quarter Horse Association. "AQHA Handbook of Rules & Regulations 2008 Rule 205 (d)". AQHA Website. American Quarter Horse Association. Archived from the original on October 7, 2008. Retrieved August 9, 2008.
  39. ^ Ellen., Frazel (2012). The American quarter horse. Minneapolis, MN: Bellwether Media. ISBN 978-1612115436. OCLC 794554681.
  40. ^ M., Baxter, Gary (2011). Adams and Stashak's Lameness in Horses (6th ed.). Somerset: Wiley. pp. Chapter 2. ISBN 9780470961773. OCLC 927499663.
  41. ^ "Details on AQHA HYP rules for registration". Archived from the original on 2009-01-20. Retrieved September 9, 2019.
  42. ^ "AQHA Handbook, Section 448 Halter Classes, (j) Performance Halter". Retrieved 30 September 2012.[permanent dead link]
  43. ^ Aleman M (2009). "Malignant Hyperthermia Associated with Ryanodine Receptor 1 (C7360G) Mutation in Quarter Horses". Journal of Veterinary Internal Medicine. 23 (2): 329–334. doi:10.1111/j.1939-1676.2009.0274.x. PMID 19220734.
  44. ^ Lenz, Tom R. "Heritable Diseases of the American Quarter Horse and Their Management" (PDF). Tom R. Lenz. Archived from the original (PDF) on 2014-06-09. Retrieved September 9, 2019.
  45. ^ "Malignant hyperthermia: a review". ResearchGate. Retrieved August 24, 2019.
  46. ^ Valberg SJ, Mickelson JR, Gallant EM, MacLeay JM, Lentz L, de la Corte F (1999). "Exertional rhabdomyolysis in quarter horses and thoroughbreds: one syndrome, multiple aetiologies". Equine Vet J Suppl. 30 (30): 533–8. doi:10.1111/j.2042-3306.1999.tb05279.x. PMID 10659313.
  47. ^ "HERDA: DNA Tests Available for Disfiguring Skin Disease". The Horse. May 28, 2007. Retrieved August 24, 2019.
  48. ^ Valberg, Stephanie; James R Mickelson. "Glycogen Branching Enzyme Deficiency (GBED) in Horses". Glycogen Branching Enzyme Deficiency (GBED). University of Minnsesota. Archived from the original on 12 May 2008. Retrieved 2008-06-12.
  49. ^ Valberg et al., "Exertional rhabdomyolysis in quarter horses and thoroughbreds", Equine Vet Journal Supplement, pp. 533–38
  50. ^ Ulman, Katherine. "Equine Exertional Rhabdomyolysis". Summer 2000 Newsletter. Purdue University, Animal Disease Diagnostic Lab. Archived from the original on 13 May 2008. Retrieved 2008-06-12.
  51. ^ "Prevalence of PSSM in Quarter Horses". The Horse. 14 September 2006. Retrieved August 24, 2019.
  52. ^ University of California – Davis. "Horse Coat Color Tests". Veterinary Genetics Laboratory. University of California at Davis. Archived from the original on 2008-02-19. Retrieved 2008-03-08.
  53. ^ Shaw, Sarah (2015). "Clinical characteristics of horses and foals diagnosed with cleft palate in a referral population: 28 cases (1988–2011)". Can Vet J. 56 (7): 756–760. PMC 4466833. PMID 26130841.
  54. ^ Kirkham, LemcN (2002). "Surgical cleft soft palate repair in a foal". Aust Vet. 80 (3): 143–146. doi:10.1111/j.1751-0813.2002.tb11375.x. PMID 12019699.

Sources

Further reading

  • Denhardt, Robert Moorman (1997). Foundation Sires of the American Quarter Horse. University of Oklahoma Press. ISBN 978-0-8061-2947-1.

External links

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