Gray (horse)
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Gray (horse)
A gray horse (or grey horse) has a coat color characterized by progressive depigmentation of the colored hairs of the coat. Most gray horses have black skin and dark eyes; unlike some equine dilution genes and some other genes that lead to depigmentation, gray does not affect skin or eye color. Gray horses may be born any base color, depending on other color genes present. White hairs begin to appear at or shortly after birth and become progressively more prevalent as the horse ages as white hairs become intermingled with hairs of other colors. Graying can occur at different rates—very quickly on one horse and very slowly on another. As adults, most gray horses eventually become completely white, though some retain intermixed light and dark hairs. The stages of graying vary widely. Some horses develop a dappled pattern for a period of time, others resemble a roan with more uniform intermixing of light and dark hairs. As they age, some gray horses, particularly those hetero ...
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Lipizzan
The Lipizzan or Lipizzaner ( hr, Lipicanac, cz, Lipicán, hu, Lipicai, it, Lipizzano, sr, Lipicaner, sl, Lipicanec), is a European breed of riding horse developed in the Habsburg Empire in the sixteenth century. It is of Baroque type, and is powerful, slow to mature and long-lived; the coat is usually gray. The name of the breed derives from that of the village of Lipica ( it, Lipizza), now in Slovenia, one of the earliest stud farms established, then part of Austria-Hungary; the stud farm there is still active. The breed has been endangered numerous times by warfare sweeping Europe, including during the War of the First Coalition, World War I, and World War II. The rescue of the Lipizzans during World War II by American troops was made famous by the Disney movie ''Miracle of the White Stallions''. The Lipizzaner is closely associated with the Spanish Riding School of Vienna, Austria, where the horses demonstrate the '' haute école'' or "high school" movements of classic ...
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Roan (horse)
Roan is a horse coat color pattern characterized by an even mixture of colored and white hairs on the body, while the head and " points"—lower legs, mane, and tail—are mostly solid-colored. Horses with roan coats have white hairs evenly intermingled throughout any other color. The head, legs, mane, and tail have fewer scattered white hairs or none at all. The roan pattern is dominantly inherited, and is found in many horse breeds. While the specific mutation responsible for roan has not been exactly identified, a DNA test can determine zygosity for roan in several breeds. True roan is always present at birth, though it may be hard to see until after the foal coat sheds out. The coat may lighten or darken from winter to summer, but unlike the gray coat color, which also begins with intermixed white and colored hairs, roans do not become progressively lighter in color as they age. The silvering effect of mixed white and colored hairs can create coats that look bluish or ...
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Foal
A foal is an equine up to one year old; this term is used mainly for horses, but can be used for donkeys. More specific terms are colt for a male foal and filly for a female foal, and are used until the horse is three or four. When the foal is nursing from its dam (mother), it may also be called a "suckling". After it has been weaned from its dam, it may be called a "weanling". When a mare is pregnant, she is said to be "in foal". When the mare gives birth, she is "foaling", and the impending birth is usually stated as "to foal". A newborn horse is "foaled". After a horse is one year old, it is no longer a foal, and is a "yearling". There are no special age-related terms for young horses older than yearlings. When young horses reach breeding maturity, the terms change: a filly over three (four in horse racing) is called a mare, and a colt over three is called a stallion. A castrated male horse is called a gelding regardless of age; however, colloquially, the term "gelding col ...
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Appaloosa
The Appaloosa is an American horse breed best known for its colorful spotted coat pattern. There is a wide range of body types within the breed, stemming from the influence of multiple breeds of horses throughout its history. Each horse's color pattern is genetically the result of various spotting patterns overlaid on top of one of several recognized base coat colors. The color pattern of the Appaloosa is of interest to those who study equine coat color genetics, as it and several other physical characteristics are linked to the leopard complex mutation (LP). Appaloosas are prone to develop equine recurrent uveitis and congenital stationary night blindness; the latter has been linked to the leopard complex. Artwork depicting prehistoric horses with leopard spotting exists in prehistoric cave paintings in Europe. Images of domesticated horses with leopard spotting patterns appeared in artwork from Ancient Greece and Han dynasty China through the early modern period. In North A ...
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Leopard Complex
The leopard complex is a group of genetically related coat patterns in horses. These patterns range from progressive increases in interspersed white hair similar to graying or roan to distinctive, Dalmatian-like leopard spots on a white coat. Secondary characteristics associated with the leopard complex include a white sclera around the eye, striped hooves and mottled skin. The leopard complex gene is also linked to abnormalities in the eyes and vision. These patterns are most closely identified with the Appaloosa and Knabstrupper breeds, though its presence in breeds from Asia to western Europe has indicated that it is due to a very ancient mutation. Leopard complex patterns Coat patterns in the leopard complex range from being hardly distinguishable from an unaffected coat, to nearly pure white. Unlike most other spotting patterns, the spotting and especially the white regions associated with the leopard complex tend to be symmetrical and originate over the hips. Furthermo ...
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Pinto Horse
A pinto horse has a coat color that consists of large patches of white and any other color. The distinction between "pinto" and "solid" can be tenuous, as so-called "solid" horses frequently have areas of white hair. Various cultures throughout history appear to have selectively bred for pinto patterns. Many breeds of horses carry pinto patterns. Pinto coloring, known simply as "coloured" in nations using British English, is the most popular in the United States. While pinto-colored horses are not considered as a "breed", several competing color breed registries have formed to encourage the breeding of pinto-colored horses. The word "paint" was sometimes used to describe pinto horses. In current usage, "paint" is specifically used for the American Paint Horse (APHA), which is a pinto-colored horse with identifiable American Quarter Horse or Thoroughbred bloodlines. Pinto patterns are visually and genetically distinct from the leopard complex spotting patterns characteri ...
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Alcock's Arabian
Alcock's Arabian (foaled about 1700, died about 1733), also known as Pelham Grey Arabian and less certainly as Bloody Buttocks and Ancaster Turk, among other names, is the ancestor of all grey-coloured Thoroughbred horses,Lady Wentworth, ''The Swift Runner: racing speed through the ages'' (G. Allen & Unwin, 1957), p. 27: "All grey thoroughbreds are descended in direct (though not exclusively male) line from the Grey Alcock Arabian, also known as the Brownlow Turk, Honeywood Arabian and Akaster Turk, the grey colour persisting through some 26 generations..." as well as grey sport and riding horses descended from Thoroughbred lines. Origins and career It was claimed in the 19th century that Sir Robert Sutton (1671–1746), English ambassador to the Ottoman Empire in Constantinople from 1700 to 1717, had acquired horses there, including Alcock's Arabian, the Holderness Turk, and the Brownlow Turk, and had had them shipped to England in 1704. However, there is no evidence that Alco ...
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Welsh Pony
The Welsh Pony and Cob is a group of four closelyrelated horse breeds including both pony and cob types, which originated in Wales in the United Kingdom. The four sections within the breed society for the Welsh breeds are primarily distinguished by height, and also by variations in type: the smallest Welsh Mountain Pony (Section A); the slightly taller but refined Welsh Pony of riding type (Section B) popular as a children's show mount; the small but stocky Welsh Pony of Cob Type (Section C), popular for riding and competitive driving; and the tallest, the Welsh Cob (Section D), which can be ridden by adults. Welsh ponies and cobs in all sections are known for their good temperament, hardiness, and free-moving gaits. Native ponies existed in Wales before 1600 BC, and a Welsh-type cob was known as early as the Middle Ages. They were influenced by the Arabian horse, and possibly also by the Thoroughbred and the Hackney horse. In 1901, the first stud book for the Welsh breeds ...
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Boulonnais Horse
The Boulonnais, also known as the "White Marble Horse", is a draft horse breed. It is known for its large but elegant appearance and is usually gray, although chestnut and black are also allowed by the French breed registry. Originally there were several sub-types, but they were crossbred until only one is seen today. The breed's origins trace to a period before the Crusades and, during the 17th century, Spanish Barb, Arabian, and Andalusian blood were added to create the modern type. During the early 1900s, the Boulonnais were imported in large numbers to the United States and were quite popular in France; however, the European population suffered severe decreases during 20th-century wars. The breed nearly became extinct following World War II, but rebounded in France in the 1970s as a popular breed for horse meat. Breed numbers remain low; it is estimated that fewer than 1,000 horses remain in Europe, mostly in France, with a few in other nations. Studies as early as 1983 indi ...
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Homozygous
Zygosity (the noun, zygote, is from the Greek "yoked," from "yoke") () is the degree to which both copies of a chromosome or gene have the same genetic sequence. In other words, it is the degree of similarity of the alleles in an organism. Most eukaryotes have two matching sets of chromosomes; that is, they are diploid. Diploid organisms have the same loci on each of their two sets of homologous chromosomes except that the sequences at these loci may differ between the two chromosomes in a matching pair and that a few chromosomes may be mismatched as part of a chromosomal sex-determination system. If both alleles of a diploid organism are the same, the organism is homozygous at that locus. If they are different, the organism is heterozygous at that locus. If one allele is missing, it is hemizygous, and, if both alleles are missing, it is nullizygous. The DNA sequence of a gene often varies from one individual to another. These gene variants are called alleles. While some gen ...
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Allele
An allele (, ; ; modern formation from Greek ἄλλος ''állos'', "other") is a variation of the same sequence of nucleotides at the same place on a long DNA molecule, as described in leading textbooks on genetics and evolution. ::"The chromosomal or genomic location of a gene or any other genetic element is called a locus (plural: loci) and alternative DNA sequences at a locus are called alleles." The simplest alleles are single nucleotide polymorphisms (SNP). but they can also be insertions and deletions of up to several thousand base pairs. Popular definitions of 'allele' typically refer only to different alleles within genes. For example, the ABO blood grouping is controlled by the ABO gene, which has six common alleles (variants). In population genetics, nearly every living human's phenotype for the ABO gene is some combination of just these six alleles. Most alleles observed result in little or no change in the function of the gene product it codes for. However, ...
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