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splashed white
Splashed white or splash is a horse coat color pattern in the "overo" family of spotting patterns that produces pink-skinned, white markings. Many splashed whites have very modest markings, while others have the distinctive "dipped in white paint" pattern. Blue eyes are a hallmark of the pattern, and splash may account for otherwise "solid" blue-eyed horses. Splashed white occurs in a variety of geographically divergent breeds, from Morgans in North America to Kathiawari horses in India. The splashed white pattern is also associated with congenital deafness, though most splashed whites have normal hearing. There now exists a DNA test for three forms of splashed white, and there is speculation that the SW-2 and SW-3 alleles may be an embryonic lethal when homozygous.〔(Splashed White Overo (SW-1, SW-2, SW-3) )〕
==Characteristics==
The splashed white pattern is characterized by the appearance of having been dipped, feet-first, into white paint. Blue eyes are common, but not universal.〔Brooks, S. ''Studies of genetic variation at the ''KIT'' locus and white spotting patterns in the horse.'' Ph.D. dissertation, University of Kentucky, 2006. ()〕〔(【引用サイトリンク】title=Splashed white )〕〔 The margins of the white markings are crisp, smooth, blocky, and well-defined.〔〔 The head and legs are white, and the tail is often white or white-tipped.〔〔〔 The underside of the body is white, and a connected white patch often spreads smoothly up either side of the thorax.〔 On its own, the splashed white pattern is seldom responsible for white markings that reach the topline, and so it has been categorized as one of the "overo" patterns by Paint horse and Pinto horse registries.〔
As sabino-type markings also originate on the underside, some splashed whites can be mistaken for cleanly marked sabinos.〔 Both patterns can be present on the same horse, but splashed white markings are crisp and blocky, and horizontally distributed. In particular, the face markings of splashed whites are straight-edged and bottom heavy, whereas those of sabinos are often tapering or feathered, and often vertical in orientation. The presence of additional white patterning genes can intensify the amount or obscure the characteristics of splashed white markings.〔〔 There is some association between splashed white and deafness in horses that are very white, but more research is needed to determine how this occurs.〔 White extending onto the ears is hypothesized to correlate to deafness. SW-1 has been found in homozygous form, but based on studies in mice, it is possible that SW-2 and SW-3 are homozygous lethals.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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