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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.
Most horses have brown eyes with minor shade variations. Blue eyes are linked to the splashed white spotting allele, and cream dilution may produce a bluish-green eye color. The champagne and pearl genes also produce lightened eye colors in the blue or green shades.
This Thoroughbred stallion (W2/+) has one form of dominant white.His skin, hooves, and coat lack pigment cells, giving him a pink-skinned white coat. Dominant white (W) [1] [2] is a group of genetically related coat color alleles on the KIT gene of the horse, best known for producing an all-white coat, but also able to produce various forms of white spotting, as well as bold white markings.
The combination of tobiano with other white-spotting patterns can produce white or nearly white horses, which may have blue eyes. [35] Sabino horses that are homozygous for the sabino-1 (Sb-1) gene are often called "sabino-white", and are all- or nearly all-white. Not all sabino horses carry Sb-1. [24]
"Glass" eye, "Moon" eye, "China" eye, "Wall" eye or "Night" eye: A blue eye. Horses with blue eyes are less common than horses with brown eyes, but can see equally well. An eye can also be partially blue. Chestnuts: A callous-like area on the inside of the horse's leg that has a subtle pattern, but one unique to each horse. It has been proposed ...
W/n, W5/W20, W20/W22, or SB1/SB1: Horse has pink skin and white hair, usually with brown or dark eyes. Hair coat is white from birth. There may be some patches of color, which may fade to white as the horse grows older. When this is caused by SB1 it may be referred to as "maximum sabino". SB1/n - Classic sabino has assorted pinto or roan-like ...
A combination of one cream and one Champagne allele may also produce a similar phenotype, though may be distinguishable by lighter yellowish or blue eyes and pale, faintly freckled skin. White vs. double dilute: White horses with blue or dark eyes and pink skin are born white and remain so throughout life. Cremello and isabelline horses that ...
Homozygous cream dilutes ("double-dilutes") have pale blue eyes, while the blue eyes associated with white markings (bottom) are a clearer, deeper color. Although usually dark brown, the iris may be a variety of colors, including blue, hazel, amber, and green. Blue eyes are not uncommon and are associated with white markings or patterns.