101-651: A white horse is a horse born white that stays white throughout its life. White Horse , or variants, may also refer to: White horse A white horse is born predominantly white and stays white throughout its life. A white horse has mostly pink skin under its hair coat, and may have brown, blue, or hazel eyes. "True white" horses, especially those that carry one of the dominant white ( W ) genes, are rare. Most horses that are commonly referred to as "white" are actually "gray" horses whose hair coats are completely white. Gray horses may be born of any color and their hairs gradually turn white as time goes by and take on
202-529: A male line to the present; the Byerley Turk's male line was preserved by Herod (or King Herod), a great-great-grandson; and the male line of the Darley Arabian owes its existence to great-great-grandson Eclipse , who was the dominant racehorse of his day and never defeated. One genetic study indicates that 95% of all male Thoroughbreds trace their direct male line (via the Y chromosome ) to
303-419: A 2001 study, 78% of alleles in the population can be traced to 30 foundation animals, 27 of which are male. Ten foundation mares account for 72% of maternal (tail-female) lineages, and, as noted, one stallion appears in 95% of tail male lineages. Thoroughbred pedigrees are generally traced through the maternal line, called the distaff line. The line that a horse comes from is a critical factor in determining
404-604: A common ancestor; in 19 mare lines studied, the haplotypes revealed that they traced to only 15 unique foundation mares, suggesting either a common ancestor for foundation mares thought to be unrelated or recording errors in the GSB. By the end of the 18th century, the English Classic races had been established. These are the St. Leger Stakes , founded in 1776, The Oaks , founded in 1779, and The Derby in 1780. Later,
505-514: A decreased chance of injury. Studies have shown that track surfaces, horseshoes with toe grabs, use of certain legal medications, and high-intensity racing schedules may also contribute to a high injury rate. One promising trend is the development of synthetic surfaces for racetracks, and one of the first tracks to install such a surface, Turfway Park in Florence, Kentucky , saw its rate of fatal breakdowns drop from 24 in 2004–05 to three in
606-502: A keen racegoer and owner, and Anne, royal support was given to racing and the breeding of race horses. With royal support, horse racing became popular with the public, and by 1727, a newspaper devoted to racing, the Racing Calendar , was founded. Devoted exclusively to the sport, it recorded race results and advertised upcoming meets. All modern Thoroughbreds trace their origin to one of three stallions imported into England from
707-734: A larger number of foundation mares of mostly English breeding. During the 18th and 19th centuries, the Thoroughbred breed spread throughout the world; they were imported into North America starting in 1730 and into Australia, Europe, Japan and South America during the 19th century. Millions of Thoroughbreds exist, and around 100,000 foals are registered each year worldwide. Thoroughbreds are used mainly for racing, but are also bred for other riding disciplines such as show jumping , combined training , dressage , polo , and fox hunting . They are also commonly crossbred to create new breeds or to improve existing ones, and have been influential in
808-561: A leopard complex coat: whether one copy (heterozygous LP/lp ) or two copies (homozygous LP/LP ) Leopard alleles are present, and the degree of dense white patterning present at birth. If a foal is homozygous for the LP allele and has extensive dense white patterning, they will appear nearly white at birth, and may continue to lighten with age. In other parts of the world, these horses are called "white born." "White born" foals are less common among Appaloosa horses than Knabstruppers or Norikers, as
909-424: A majority of animals who are prone to bleeding from the lungs ( exercise induced pulmonary hemorrhage ), 10% with low fertility, and 5% with abnormally small hearts. Thoroughbreds also tend to have smaller hooves relative to their body mass than other breeds, with thin soles and walls and a lack of cartilage mass, which contributes to foot soreness, the most common source of lameness in racehorses. One argument for
1010-582: A meet in Milan was founded in 1842. Modern flat racing came to Rome in 1868. Later importations, including the Derby Stakes winners Ellington (1856) and Melton (1885), came to Italy before the end of the 19th century. Modern Thoroughbred breeding in Italy is mostly associated with the breeding program of Federico Tesio , who started his breeding program in 1898. Tesio was the breeder of Nearco , one of
1111-484: A minimal amount of pigment. White markings are usually visible upon closer inspection. Although white horses are sometimes called "albino" there are few cases of a true " albino " horse. There are also references in literature calling white horses "albino". Dominant white in horses is caused by the absence of pigment cells ( melanocytes ), whereas albino animals have a normal distribution of melanocytes. In other animals, patches of unpigmented skin, hair, or eyes due to
SECTION 10
#17327647743631212-610: A race in the United States, an average of two horses per day. The state of California reported a particularly high rate of injury, 3.5 per 1000 starts. Other countries report lower rates of injury, with the United Kingdom having 0.9 injuries/1,000 starts (1990–1999) and the courses in Victoria, Australia , producing a rate of 0.44 injuries/1,000 starts (1989–2004). Thoroughbreds also have other health concerns, including
1313-450: A result, birds and reptiles without the ability to manufacture tyrosinase are more accurately described as " amelanistic ." Horses do not have non-melanin pigments and so if they were albino, would have no pigmentation. The retained pigment of dilute horses, like cremellos, is not comparable to the retained pigment of amelanistic "albino" birds and reptiles. The cream gene, which is responsible for palomino, buckskin, and cremello coat colors,
1414-578: A row. After the American Civil War , the emphasis in American racing changed from the older style of four-mile (6 km) races in which the horses ran in at least two heats. The new style of racing involved shorter races not run in heats, over distances from five furlongs up to 1.5 miles (2.4 km). This development meant a change in breeding practices, as well as the age that horses were raced, with younger horses and sprinters coming to
1515-565: A short back, good depth of hindquarters, a lean body, and long legs. Thoroughbreds are classified among the "hot-blooded" breeds, which are animals bred for agility and speed and are generally considered spirited and bold. Thoroughbreds born in the Northern Hemisphere are officially considered a year older on the first of January each year; those born in the Southern Hemisphere officially are one year older on
1616-474: A stallion . Artificial insemination (AI) and embryo transfer (ET), though commonly used and allowable in many other horse breed registries, cannot be used with Thoroughbreds. One reason is that a greater possibility of error exists in assigning parentage with artificial insemination, and although DNA and blood testing eliminate many of those concerns, artificial insemination still requires more detailed record keeping. The main reason, however, may be economic;
1717-462: A stallion has a limited number of mares who can be serviced by live cover. Thus the practice prevents an oversupply of Thoroughbreds, although modern management still allows a stallion to live cover more mares in a season than was once thought possible. As an example, in 2008, the Australian stallion Encosta De Lago covered 227 mares. By allowing a stallion to cover only a couple of hundred mares
1818-503: A total of only 27 or 28 stallions from the 18th and 19th centuries. The mares used as foundation breeding stock came from a variety of breeds, some of which, such as the Irish Hobby , had developed in northern Europe prior to the 13th century. Other mares were of oriental breeding, including Barb, Turk and other bloodlines, although most researchers conclude that the number of Eastern mares imported into England during
1919-580: A total value of 43,033,881 guineas, making an average of 15,110 guineas per horse. Australian prices at auction during the 2007–2008 racing and breeding season were as follows: 1,223 Australian weanlings sold for a total of $ 31,352,000, an average of $ 25,635 each. Four thousand, nine hundred and three yearlings sold for a total value of A$ 372,003,961, an average of A$ 75,853. Five hundred two-year-olds sold for A$ 13,030,150, an average of A$ 26,060, and 2,118 broodmares totalled A$ 107,720,775, an average of A$ 50,860. Averages, however, can be deceiving. For example, at
2020-688: A white appearance. Nearly all gray horses have dark skin, except under any white markings present at birth. Skin color is the most common method for an observer to distinguish between mature white and gray horses. White horses have unpigmented skin and a white hair coat. Many white horses have dark eyes, though some have blue eyes. In contrast to gray horses which are born with pigmented skin they keep for life and pigmented hair that lightens to white with age, truly white horses are born with white hair and mostly pink, unpigmented skin. Some white horses are born with partial pigmentation in their skin and hair, which may or may not be retained as they mature, but when
2121-453: A white horse lightens, both skin and hair lose pigmentation. In contrast, grays retain skin pigment and only the hair becomes white. White colorings, whether white markings , white patterns or dominant white are collectively known as depigmentation phenotypes , and are all caused by areas of skin that lack pigment cells ( melanocytes ). Depigmentation phenotypes have various genetic causes, and those that have been studied usually map to
SECTION 20
#17327647743632222-405: A wide range of pigmentation levels as a species. However, the diagnosis of albinism in humans is based on visual impairment , which has not been described in white horses. Vision problems are not associated with gray, dilute, or white coat colors in horses, and blue eyes in horses do not indicate poor vision. Eyes are pigmented at the front of the iris called the stroma , and in a thin layer at
2323-412: A year rather than the couple of thousand possible with artificial insemination, it also preserves the high prices paid for horses of the finest or most popular lineages. Concern exists that the closed stud book and tightly regulated population of the Thoroughbred is at risk of loss of genetic diversity because of the level of inadvertent inbreeding inevitable in such a small population. According to
2424-420: A young horse (including foals) may actually be beneficial to the overall soundness of the animal. This is because, during the training process, microfractures occur in the leg followed by bone remodeling. If the remodeling is given sufficient time to heal, the bone becomes stronger. If proper remodeling occurs before hard training and racing begins, the horse will have a stronger musculoskeletal system and will have
2525-415: A younger age than in the past and that had more speed. In the early 18th century, the emphasis had been on longer races, up to 4 miles (6.4 km), that were run in multiple heats. The older style of race favored older horses, but with the change in distances, younger horses became preferred. Selective breeding for speed and racing ability led to improvements in the size of horses and winning times by
2626-489: Is OCA1A , which impairs tyrosinase production. In other mammals , the diagnosis of albinism is based on the impairment of tyrosinase production through defects in the Color ( C ) gene . Mice and other mammals without tyrosinase have unpigmented pink skin, unpigmented white hair, unpigmented reddish eyes, and some form of vision impairment. No mutations of the tyrosinase or C gene are known in horses. Humans exhibit
2727-692: Is a proper noun referring to this specific breed, though often not capitalized, especially in non-specialist publications, and outside the US. For example, the Australian Stud Book, The New York Times , and the BBC do not capitalize the word. Flat racing existed in England by at least 1174, when four-mile races took place at Smithfield , in London. Racing continued at fairs and markets throughout
2828-632: Is a genetic disorder linked to the Frame overo (O) gene and most closely studied in the American Paint Horse . Affected foals are carried to term and at birth appear normal, though they have pink-skinned all-white or nearly-white coats and blue eyes. However, the colon of these foals cannot function due to the absence of nerve cells , and the condition cannot be treated. Foals with Lethal White Syndrome invariably die of colic within 72 hours, and are usually humanely euthanized . Carriers of
2929-407: Is a large agribusiness , generating around $ 34 billion in revenue annually in the United States and providing about 470,000 jobs through a network of farms, training centers, and race tracks . Unlike a significant number of registered breeds, a horse cannot be registered as a Thoroughbred (with The Jockey Club registry) unless conceived by live cover , the witnessed natural mating of a mare and
3030-405: Is also used for show jumping and combined training because of its athleticism, and many retired and retrained race horses become fine family riding horses, dressage horses, and youth show horses. The larger horses are sought for hunter/jumper and dressage competitions, whereas the smaller horses are in demand as polo ponies. Thoroughbred horses are primarily bred for racing under saddle at
3131-412: Is responsible for a form of albinism. Many famous horses, past and present, were alleged to be "white" by observers, but were actually grays with hair coats turned fully white. Likewise, most white horses used in movies are actually grays , in part because they are easier to find. However, there are a few truly white horses who were used in film. One of the best-known examples was "Silver," ridden by
White horse (disambiguation) - Misplaced Pages Continue
3232-610: Is thought to be largely responsible for the gray coat color in Thoroughbreds. In all, about 160 stallions have been traced in the historical record as contributing to the creation of the Thoroughbred. The addition of horses of Eastern bloodlines, whether Arabian, Barb, or Turk, to the native English mares ultimately led to the creation of the General Stud Book (GSB) in 1791 and the practice of official registration of horses. According to Peter Willett, about 50% of
3333-403: Is very rare, but is a recognized color separate from gray. The face and lower legs may be marked with white, but white will generally not appear on the body. Coat patterns that have more than one color on the body, such as Pinto or Appaloosa , are not recognized by mainstream breed registries. Good-quality Thoroughbreds have a well-chiseled head on a long neck, high withers , a deep chest,
3434-597: The EDNRB and KIT genes. However, much about the genetics behind various all-white depigmentation phenotypes are still unknown. Dominant white (W) is a large group of alleles best known for producing pink-skinned all-white horses with brown eyes, though some dominant white horses have residual pigment along the topline. Some W alleles produce white spotting on horses with a predominately dark coat. Dominant white has been studied in Thoroughbreds , Arabian horses ,
3535-478: The 2,000 Guineas Stakes and the 1,000 Guineas Stakes were founded in 1809 and 1814. The 1,000 Guineas and the Oaks are restricted to fillies , but the others are open to racehorses of either sex aged three years. The distances of these races, ranging from one mile (1.6 km) to 1.75 miles (2.82 km), led to a change in breeding practices, as breeders concentrated on producing horses that could race at
3636-549: The Achaemenid court of Xerxes the Great (ruled 486–465 BC), In more than one tradition, a white horse carries patron saints or the world saviour in the end times, including Hinduism , Christianity , and Islam . Thoroughbred The Thoroughbred is a horse breed developed for horse racing . Although the word thoroughbred is sometimes used to refer to any breed of purebred horse, it technically refers only to
3737-578: The American Civil War were both between Lexington and Lecompte. The first was held in 1854 in New Orleans and was won by Lecompte. Lexington's owner then challenged Lecompte's owner to a rematch, held in 1855 in New Orleans and won by Lexington. Both of these horses were sons of Boston, a descendant of Sir Archy. Lexington went on to a career as a breeding stallion, and led the sires list of number of winners for sixteen years, fourteen of them in
3838-676: The American Colonies was Bulle Rock , imported in 1730. Maryland and Virginia were the centers of Colonial Thoroughbred breeding, along with South Carolina and New York. During the American Revolution importations of horses from England practically stopped but were restarted after the signing of a peace treaty. Two important stallions were imported around the time of the Revolution; Messenger in 1788 and Diomed before that. Messenger left little impact on
3939-962: The American White horse , the Camarillo White Horse , and several other breeds. There are 32 identified variants of dominant white as of 2021, plus sabino 1 , each corresponding to a spontaneously-white foundation animal and a mutation on the KIT gene. Researchers have suggested that at least some forms of dominant white result in nonviable embryos in the homozygous state, though others are known to be viable as homozygotes. While homologous mutations in mice are often linked to anemia and sterility , no such effects have been observed in dominant white horses. Dominant white horses typically have white noses that can be subject to sunburn . Sabino-white horses are pink-skinned with all-white or nearly-white coats and dark eyes. They are homozygous for
4040-525: The Arabian horse , Clydesdale , Thoroughbred , Standardbred horse , or Shire horse . The Sabino 1 allele is not linked to any health defects, though sabino-whites may need some protection from sunburn . Horses with only one copy of the Sabino1 gene usually have dramatic spotting, including two or more white legs, often with white running up the front of the leg, extensive white on the face, spotting on
4141-709: The Dutch Warmblood , Hanoverian , and Selle Français . Some warmblood registries note the percentage of Thoroughbred breeding, and many warmblood breeds have an open stud book that continues to allow Thoroughbred crossbreeding. Although Thoroughbreds are seen in the hunter-jumper world and in other disciplines, modern Thoroughbreds are primarily bred for speed, and racehorses have a very high rate of accidents as well as other health problems. One tenth of all Thoroughbreds suffer orthopedic problems, including fractures. Current estimates indicate that there are 1.5 career-ending breakdowns for every 1,000 horses starting
White horse (disambiguation) - Misplaced Pages Continue
4242-648: The Lone Ranger , a role actually played by two different white horses. At least one horse who played "Topper," ridden by Hopalong Cassidy , was also white. Another famous white horse is Sodashi , a Japanese Thoroughbred racehorse who won Grade 1 races including Hanshin Juvenile Fillies , Oka Sho (Japanese 1,000 Guineas) , and Victoria Mile . Throughout history, white horses have been mythologized in many cultures. For example, Herodotus reported that white horses were held as sacred animals in
4343-500: The Middle Ages and into the reign of King James I of England . It was then that handicapping , a system of adding weight to attempt to equalize a horse's chances of winning as well as improved training procedures, began to be used. During the reigns of Charles II , William III , Anne , and George I , the foundation of the Thoroughbred was laid. The term "thro-bred" to describe horses was first used in 1713. Under Charles II,
4444-1079: The Morgan , a breed that went on to influence many of the gaited breeds in North America. Other common crosses with the Thoroughbred include crossbreeding with Arabian bloodlines to produce the Anglo-Arabian as well as with the Irish Draught to produce the Irish Sport Horse . Thoroughbreds have been foundation bloodstock for various Warmblood breeds due to their refinement and performance capabilities. Crossbred horses developed from Thoroughbreds, (informally categorized as "hot bloods" because of temperament) crossed on sturdy draft horse breeds, (classified as "cold bloods" for their more phlegmatic temperament) are known as "warmbloods," which are commonly seen in competitive events such as show jumping and dressage. Examples include
4545-647: The Paso Fino Horse Association registers cremellos and other cream colors as "albino." Until 1999, the American Quarter Horse Association (AQHA) described perlino or cremello horses as "albino" in rule 227(j). The AQHA later replaced the word "albino" with "cremello or perlino," and in 2002 the rule was removed entirely. Among Connemara pony breeders, homozygous creams are called "blue-eyed creams" or sometimes "pseudo-albino". The best-known type of albinism
4646-457: The U.S. Army used Thoroughbred stallions as part of their Remount Service , which was designed to improve the stock of cavalry mounts. Thoroughbreds began to be imported to France in 1817 and 1818 with the importation of a number of stallions from England, but initially the sport of horse racing did not prosper in France. The first Jockey Club in France was not formed until 1833, and in 1834
4747-535: The United States before Messenger and Diomed, became important broodmare and dam sires by producing foundation stock , and their daughters and granddaughters were bred primarily to Diomed . After the American Revolution, the center of Thoroughbred breeding and racing in the United States moved west. Kentucky and Tennessee became significant centers. Andrew Jackson , later President of
4848-567: The gallop . Thoroughbreds are often known for being either distance runners or sprinters, and their conformation usually reflects what they have been bred to do. Sprinters are usually well muscled, while stayers , or distance runners, tend to be smaller and slimmer. The size of the horse is one consideration for buyers and trainers when choosing a potential racehorse. Although there have been champion racehorses of every height, from Zenyatta who stood 17.2 hands, to Man o' War and Secretariat who both stood at 16.2 hands, down to Hyperion , who
4949-424: The 100 years after 1660 was small. The 19th-century researcher Bruce Lowe identified 50 mare "families" in the Thoroughbred breed, later augmented by other researchers to 74. However, it is probable that fewer genetically unique mare lines existed than Lowe identified. Recent studies of the mtDNA of Thoroughbred mares indicate that some of the mare lines thought to be genetically distinct may actually have had
5050-494: The 1830s, the Australian colonies began to import Thoroughbreds, almost exclusively for racing purposes, and to improve the local stock. Each colony formed its own racing clubs and held its own races. Gradually, the individual clubs were integrated into one overarching organization, now known as the Australian Racing Board . Thoroughbreds from Australia were imported into New Zealand in the 1840s and 1850s, with
5151-522: The 2007 Fall Yearling sale at Keeneland, 3,799 young horses sold for a total of $ 385,018,600, for an average of $ 101,347 per horse. However, that average sales price reflected a variation that included at least 19 horses that sold for only $ 1,000 each and 34 that sold for over $ 1,000,000 apiece. The highest price paid at auction for a Thoroughbred was set in 2006 at $ 16,000,000 for a two-year-old colt named The Green Monkey . Record prices at auction often grab headlines, though they do not necessarily reflect
SECTION 50
#17327647743635252-587: The American Thoroughbred, but is considered a foundation sire of the Standardbred breed. Diomed, who won the Derby Stakes in 1780, had a significant impact on American Thoroughbred breeding, mainly through his son Sir Archy . John F. Wall, a racing historian, said that Sir Archy was the "first outstanding stallion we can claim as native American." He was retired from the racetrack because of lack of opponents. Medley and Shark, who arrived in
5353-686: The British Racing Authority states there were 8,556 horses in training for flat racing for 2007, and those horses started 60,081 times in 5,659 races. Statistically, fewer than 50% of all race horses ever win a race, and less than 1% ever win a stakes race such as the Kentucky Derby or Epsom Derby . Any horse who has yet to win a race is known as a maiden. Horses finished with a racing career that are not suitable for breeding purposes often become riding horses or other equine companions. A number of agencies exist to help make
5454-500: The Darley Arabian. However, in modern Thoroughbred pedigrees, most horses have more crosses to the Godolphin Arabian (13.8%) than to the Darley Arabian (6.5%) when all lines of descent (maternal and paternal) are considered. Further, as a percentage of contributions to current Thoroughbred bloodlines, Curwen's Bay Barb (4.2%) appears more often than the Byerley Turk (3.3%). The majority of modern Thoroughbreds alive trace to
5555-520: The English Thoroughbred's General Stud Book was one of the first breed registries created, in modern usage horse breeders consider it incorrect to refer to any animal as a thoroughbred except for horses belonging to the Thoroughbred breed. Nonetheless, breeders of other species of purebred animals may use the two terms interchangeably, though thoroughbred is less often used for describing purebred animals of other species. The term
5656-602: The GSB. The act was not repealed until 1949, after which a horse was only required to show that all its ancestors to the ninth generation were registered in a recognized Stud Book. Many felt that the Jersey Act hampered the development of the British Thoroughbred by preventing breeders in the United Kingdom from using new bloodlines developed outside the British Isles. The first Thoroughbred horse in
5757-785: The Middle East in the late 17th and early 18th centuries: the Byerley Turk (1680s), the Darley Arabian (1704), and the Godolphin Arabian (1729). Other imported stallions were less influential, but still made noteworthy contributions to the breed. These included the Alcock's Arabian , D'Arcy's White Turk, Leedes Arabian, and Curwen's Bay Barb . Another was the Brownlow Turk, who, among other attributes,
5858-432: The Thoroughbred breed. Thoroughbreds are considered " hot-blooded " horses that are known for agility, speed, and spirit. The Thoroughbred was developed in 17th- and 18th-century England, when native mares were crossbred with imported stallions of Arabian , Barb , and Turkoman breeding. All modern Thoroughbreds can trace their pedigrees to three stallions imported into England in the 17th and 18th centuries, and to
5959-536: The United States , was a breeder and racer of Thoroughbreds in Tennessee. Match races held in the early 19th century helped to popularize horse racing in the United States. One took place in 1823, in Long Island, New York , between Sir Henry and American Eclipse . Another was a match race between Boston and Fashion in 1838 that featured bets of $ 20,000 from each side. The last major match races before
6060-539: The United States have historically been used not only for racing but also to improve other breeds. The early import Messenger was the foundation of the Standardbred, and Thoroughbred blood was also instrumental in the development of the American Quarter Horse . The foundation stallion of the Morgan breed is held by some to have been sired by a Thoroughbred. Between World War I and World War II,
6161-463: The United States, and from £2000 to £75,000 or more in Britain. The record stud fee to date was set in the 1980s, when the stud fee of the late Northern Dancer reached $ 1 million. During the 2008 Australian breeding season seven stallions stood at a stud fee of A$ 110,000 or more, with the highest fee in the nation at A$ 302,500. Although the Thoroughbred is primarily bred for racing , the breed
SECTION 60
#17327647743636262-414: The anatomy of the horse cannot always cope with." Poor breeding may be encouraged by the fact that many horses are sent to the breeding shed following an injury. If the injury is linked to a conformational fault , the fault is likely to be passed to the next generation. Additionally, some breeders will have a veterinarian perform straightening procedures on a horse with crooked legs. This can help increase
6363-417: The animal's future success; in the case of The Green Monkey, injuries limited him to only three career starts before being retired to stud in 2008, and he never won a race. Conversely, even a highly successful Thoroughbred may be sold by the pound for a few hundred dollars to become horsemeat . The best-known example of this was the 1986 Kentucky Derby winner Ferdinand , exported to Japan to stand at stud, but
6464-537: The average weanling sold for $ 44,407, the average yearling sold for $ 55,300, average sale price for two-year-olds was $ 61,843, broodmares averaged $ 70,150, and horses over two and broodmare prospects sold for an average of $ 53,243. For Europe, the July 2007 Tattersall's Sale sold 593 horses at auction, with a total for the sale of 10,951,300 guineas , for an average of 18,468 guineas. Also in 2007, Doncaster Bloodstock Sales, another British sales firm, sold 2,248 horses for
6565-627: The average height of a Thoroughbred in 1700 was about 13.3 hands high. By 1876 this had increased to 15.3. In 2007, there were 71,959 horses who started in races in the United States, and the average Thoroughbred racehorse in the United States and Canada ran 6.33 times in that year. In Australia, there were 31,416 horses in training during 2007, and those horses started 194,066 times for A$ 375,512,579 of prize money. During 2007, in Japan, there were 23,859 horses in training and those horses started 182,614 times for A$ 857,446,268 of prize money. In Britain,
6666-426: The back of the iris in tissue called the iris pigment epithelium . The iris pigment epithelium prevents damaging light scattering within the eye. Blue-eyed humans and mammals have little or no pigment in the stroma, but retain pigment in the iris pigment epithelium. If pigment is missing from both the stroma and the iris pigment epithelium, the only pigment in the eye is the hemoglobin in blood vessels. This accounts for
6767-407: The best Arabian of the time, Asil. The race was over 3 miles (4,800 m), and although Iambic was handicapped by carrying 4.5 stone (29 kg; 63 lb) more than Asil, he still managed to beat Asil by 20 lengths. The improvement of the breed for racing in this way was said by noted 19th century racing writer, Nimrod, to have created "the noblest animal in the creation". An aspect of
6868-511: The colored hairs of their coat become progressively silvered as they age, eventually giving mature gray horses a white or nearly-white hair coat. Gray is controlled by a single dominant allele of a gene that regulates specific kinds of stem cells . Gray horses are at an increased risk for melanoma; 70-80% of gray horses over the age of 15 have a melanoma tumor. True white hair is rooted in unpigmented skin that lacks melanocytes. In contrast, diluted coat colors have melanocytes, but vary due to
6969-411: The concentration or chemical structure of the pigments made by these pigment-producing cells, not the absence of the cells themselves. There are at least five known types of pigment dilution in horses, three which, as described below, can act to produce off-white phenotypes. Horses with strongly diluted coat colors usually have pale eyes (usually blue), cream-colored coats, and rosy-pink skin that contains
7070-478: The creation of the Quarter Horse , Standardbred , Anglo-Arabian , and various warmblood breeds. Thoroughbred racehorses perform with maximum exertion, which has resulted in high accident rates and health problems such as bleeding from the lungs . Other health concerns include low fertility , abnormally small hearts, and a small hoof-to-body-mass ratio. There are several theories for the reasons behind
7171-606: The dominant SB1 allele at the Sabino 1 locus , which has been mapped to KIT . Sabino-white was one of the earliest dominant white alleles discovered, but was not originally recognized as such, hence the different name. The Sabino1 allele, and the associated spotting pattern, is found in Miniature horses , American Quarter Horses , American Paint Horses , Tennessee Walkers , Missouri Fox Trotters , Mustangs , Shetland Ponies , and Aztecas . Sabino 1 has not been found in
7272-582: The dominant sires of Thoroughbreds in the later part of the 20th century. Other countries in Europe have Thoroughbred breeding programs, including Germany, Russia, Poland, and Hungary. Horses arrived in Australia with the First Fleet in 1788 along with the earliest colonists. Although horses of part-Thoroughbred blood were imported into Australia during the late 18th century, it is thought that
7373-610: The early 1910s, led to the Jersey Act of 1913. It prohibited the registration of any horse in the General Stud Book (GSB) if they could not show that every ancestor traced to the GSB. This excluded most American-bred horses, because the 100-year gap between the founding of the GSB and the American Stud Book meant that most American-bred horses possessed at least one or two crosses to horses not registered in
7474-486: The extensive dense white patterning is favored for producing dramatic full leopards. Homozygous leopards have the LP/LP genotype, and may be varnish roan , fewspot leopard, or snowcap patterned. Homozygous leopards are substantially more prone to congenital stationary night blindness . Congenital stationary night blindness is present at birth and is characterized by impaired vision in dark conditions. Lethal white syndrome
7575-551: The first direct importation from England occurring in 1862. Thoroughbreds have been exported to many other areas of the world since the breed was created. Oriental horses were imported into South Africa from the late 17th century in order to improve the local stock through crossbreeding. Horse racing was established there in the late 18th and early 19th centuries, and Thoroughbreds were imported in increasing numbers. The first Thoroughbred stallions arrived in Argentina in 1853, but
7676-441: The first mares did not arrive until 1865. The Argentine Stud Book was first published in 1893. Thoroughbreds were imported into Japan from 1895, although it was not until after World War II that Japan began a serious breeding and racing business involving Thoroughbreds. The number of Thoroughbred foals registered each year in North America varies greatly, chiefly linked to the success of the auction market which in turn depends on
7777-438: The first of August. These artificial dates have been set to enable the standardization of races and other competitions for horses in certain age groups. The Thoroughbred is a distinct breed of horse, although people sometimes refer to a purebred horse of any breed as a thoroughbred . The term for any horse or other animal derived from a single breed line is purebred . While the term probably came into general use because
7878-531: The first pureblood Thoroughbred was a stallion named Northumberland who was imported from England in 1802 as a coach horse sire. By 1810, the first formal race meets were organized in Sydney, and by 1825 the first mare of proven Thoroughbred bloodlines arrived to join the Thoroughbred stallions already there. In 1825, the Sydney Turf Club , the first true racing club in Australia, was formed. Throughout
7979-933: The fore. It was also after the Civil War that the American Thoroughbred returned to England to race. Iroquois became the first American-bred winner of the Epsom Derby in 1881. The success of American-bred Thoroughbreds in England led to the Jersey Act in 1913, which limited the importation of American Thoroughbreds into England. After World War I , the breeders in America continued to emphasize speed and early racing age but also imported horses from England, and this trend continued past World War II. After World War II , Thoroughbred breeding remained centered in Kentucky, but California , New York, and Florida also emerged as important racing and breeding centers. Thoroughbreds in
8080-431: The foundation stallions appear to have been of Arabian bloodlines, with the remainder being evenly divided between Turkoman and Barb breeding. Each of the three major foundation sires was, coincidentally, the ancestor of a grandson or great-great-grandson who was the only male descendant to perpetuate each respective horse's male line: Matchem was the only descendant of his grandsire, the Godolphin Arabian, to maintain
8181-507: The gene, who are healthy and normal, can be identified by a DNA test . While carriers often exhibit the "frame overo" pattern, this is not a dispositive trait and testing is necessary, as the pattern can appear in a minimal form as normal white markings or be masked by other white spotting genes. Genetically white horses have unpigmented pink skin (except where a horse with a W allele may have some darker pigmented areas) and unpigmented white hair, though eye color varies. The lack of pigment in
8282-494: The health issues involving Thoroughbreds suggests that inbreeding is the culprit. It has also been suggested that capability for speed is enhanced in an already swift animal by raising muscle mass, a form of selective breeding that has created animals designed to win horse races . Thus, according to one postulation, the modern Thoroughbred travels faster than its skeletal structure can support. Veterinarian Robert M. Miller states that "We have selectively bred for speeds that
8383-554: The horse's price at a sale and perhaps help the horse have a sounder racing career, but the genes for poor legs will still be passed on. A high accident rate may also occur because Thoroughbreds, particularly in the United States, are first raced as 2-year-olds, well before they are completely mature. Though they may appear full-grown and are in superb muscular condition, their bones are not fully formed. However, catastrophic injury rates are higher in 4- and 5-year-olds than in 2- and 3-year-olds. Some believe that correct, slow training of
8484-574: The lack of pigment cells ( melanocytes ) are called piebaldism , not albinism nor partial albinism. All so-called "albino" horses have pigmented eyes, generally brown or blue. While true albino horses will have a pale blue or white eye. In contrast, many albino mammals, such as mice or rabbits, typically have a white hair coat, unpigmented skin and reddish eyes. The definition of " albinism " varies depending on whether humans, other mammals, or other vertebrates are being discussed. Despite this, some registries still refer to "albino" horses. For example,
8585-408: The middle of the 19th century. Bay Middleton , a winner of the Epsom Derby, stood over 16 hands high, a full hand higher than the Darley Arabian. Winning times had improved to such a degree that many felt further improvement by adding additional Arabian bloodlines was impossible. This was borne out in 1885, when a race was held between a Thoroughbred, Iambic, considered a mid-grade runner, and
8686-511: The midsection, and jagged or roaned margins to the pattern. The leopard complex, related to the Leopard ( LP ) gene, characterizes the Appaloosa and Knabstrupper breeds with their spotted coats. Leopard is genetically quite distinct from all other white and white-spotting patterns. The fewspot leopard pattern, however, can resemble white. Two factors influence the eventual appearance of
8787-454: The modern British breeding establishment is that they breed not only for flat racing, but also for steeplechasing . Up until the end of the 19th century, Thoroughbreds were bred not only for racing but also as saddle horses. Soon after the start of the 20th century, fears that the English races would be overrun with American-bred Thoroughbreds because of the closing of US racetracks in
8888-407: The most common breeds for use in polo in the United States. They are often seen in the fox hunting field as well. Thoroughbreds are often crossed with horses of other breeds to create new breeds or to enhance or introduce specific qualities into existing ones. They have been influential on many modern riding horse breeds, such as the American Quarter Horse , the Standardbred , and possibly
8989-557: The most noticeable difference between a gray horse whose hair coat is completely white and a white horse is skin color: most gray horses have black skin and dark eyes, white horses have light, unpigmented skin. The gray gene does not affect skin or eye color, so grays typically have dark skin and eyes, as opposed to the unpigmented pink skin of true white horses. The skin and eyes may be other colors if influenced by other factors such as white markings , certain white spotting patterns or dilution genes . Gray foals may be born any color, but
9090-453: The prevalence of accidents and health problems in the Thoroughbred breed, and research on the subject is ongoing. The typical Thoroughbred ranges from 15.2 to 17.0 hands (62 to 68 inches, 157 to 173 cm) high, averaging 16 hands (64 inches, 163 cm). They are most often bay , dark bay or brown , chestnut , black , or gray . Less common colors recognized in the United States include roan and palomino . White
9191-407: The price for a young horse. Prices of Thoroughbreds vary greatly, depending on age, pedigree , conformation , and other market factors. In 2007, Keeneland Sales , a United States–based sales company, sold 9,124 horses at auction, with a total value of $ 814,401,000, which gives an average price of $ 89,259. As a whole for the United States in 2007, The Jockey Club auction statistics indicated that
9292-530: The racing and regulation functions were split off to a new society, the Société d'Encouragement pour l'Amélioration des Races de Chevaux en France , better known as the Jockey-Club de Paris . The French Stud Book was founded at the same time by the government. By 1876, French-bred Thoroughbreds were regularly winning races in England, and in that year a French breeder-owner earned the most money in England on
9393-400: The reddish appearance of eyes in some types of albinism. In research mammals, such as mice, albinism is more strictly defined. Albino mice occur due to a recessive mutation of the C gene. No such mutation exists in horses. Albino mice lack pigment, but "...the inability of albino animals to produce pigment stems not from an absence of melanocytes...but from a deficiency and/or alteration of
9494-412: The skin and hair is caused by the absence of pigment-producing cells called melanocytes . Some coat colors are characterized by light or white-like coats and even pinkish skin, however these white-like coats are not lacking melanocytes. Instead, white-like coat colors result from various changes in the ways melanocytes produce pigment . Gray horses have the most common "white-like" coat color. However,
9595-556: The state of the economy. The foal crop was over 44,000 in 1990, but declined to roughly 22,500 by 2014. The largest numbers are registered in the states of Kentucky, Florida and California. Australia is the second largest producer of Thoroughbreds in the world with almost 30,000 broodmares producing about 18,250 foals annually. Britain produces about 5,000 foals a year, and worldwide, there are more than 195,000 active broodmares , or females being used for breeding, and 118,000 newly registered foals in 2006 alone. The Thoroughbred industry
9696-481: The structure of tyrosinase in melanocytes which are otherwise normal." This definition of albinism in mice – the inability to make tyrosinase – is extended to other mammals. While mammals derive their pigments only from melanins, fish, reptiles and birds rely on a number of pigments apart from melanins: carotenoids, porphyrins, psittacofulvins, pterins, etc. Most commonly, reptiles with a condition homologous to human OCA1A retain their reddish and orangish hues. As
9797-600: The track. World War I almost destroyed French breeding because of war damage and lack of races. After the war, the premier French race, the Grand Prix, resumed and continues to this day. During World War II , French Thoroughbred breeding did not suffer as it had during the first World War, and thus was able to compete on an equal footing with other countries after the war. Organized racing in Italy started in 1837, when race meets were established in Florence and Naples and
9898-631: The transition from the racetrack to another career, or to help find retirement homes for ex-racehorses. In addition to racing, Thoroughbreds compete in eventing , show jumping and dressage at the highest levels of international competition, including the Olympics . They are also used as show hunters , steeplechasers , and in Western riding speed events such as barrel racing . Mounted police divisions employ them in non-competitive work, and recreational riders also use them. Thoroughbreds are one of
9999-566: Was mapped to the MATP gene in 2003 (now known as SLC45A2 ). This gene is sometimes called the OCA4 gene, because one mutation on SLC45A2 is associated with Oculocutaneous albinism type 4. However, other mutations in SLC45A2 are responsible for normal variations in skin, hair, and eye color in humans and . Although SLC45A2 is not the "albino gene"; one of many mutations of the human SLC45A2
10100-407: Was only 15.1, the best racehorses are generally of average size. Larger horses mature more slowly and have more stress on their legs and feet, predisposing them to lameness. Smaller horses are considered by some to be at a disadvantage due to their shorter stride and a tendency of other horses to bump them, especially in the starting gate. Historically, Thoroughbreds have steadily increased in size:
10201-470: Was ultimately slaughtered in 2002, presumably for pet food. However, the value of a Thoroughbred may also be influenced by the purse money it wins. In 2007, Thoroughbred racehorses earned a total of $ 1,217,854,602 in all placings, an average earnings per starter of $ 16,924. In addition, the track record of a race horse may influence its future value as a breeding animal. Stud fees for stallions that enter breeding can range from $ 2,500 to $ 500,000 per mare in
#362637