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Though common in some breeds of cats, dogs, cattle and horses due to inbreeding, heterochromia is uncommon in humans, affecting fewer than 200,000 people in the United States, and is not associated with lack of genetic diversity. [4] [5] The affected eye may be hyperpigmented (hyperchromic) or hypopigmented (hypochromic). [3]
The white spotting patterns most often linked to blue eyes are splashed white, frame overo, and sometimes sabino. [4] In the case of horses with white markings, one or both eyes may be blue, or part-blue. Homozygous cream dilutes, sometimes called double-dilutes, always have light blue eyes to match their pale, cream-colored coats. [5]
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.
This blue-eyed, pink-skinned, whitish filly is, in fact, a cremello, and is healthy. Her skin is a rosier shade and her coat cream-colored, as opposed to stark white. Not all white, blue-eyed foals are affected with LWS. Other genes can produce healthy pink-skinned, blue-eyed horses with a white or very light cream-colored coat. [14]
A horse with rosy-pink skin and blue eyes in adulthood is most often a cremello or a perlino, a horse carrying two cream dilution genes. [7] Sooty palomino horses may have darker hairs in the mane, tail and coat. [8] The summer coat of a palomino is usually a slightly darker shade than the winter coat. [8]
"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 ...
Both the eyes and legs are still of the normal colour. Leucism (/ ˈ l uː s ɪ z əm,-k ɪ z-/) [2] [3] [4] is a wide variety of conditions that result in partial loss of pigmentation in an animal—causing white, pale, or patchy coloration of the skin, hair, feathers, scales, or cuticles, but not the eyes. [4] It is occasionally spelled leukism.
Many people who are unfamiliar with horses refer to a gray horse as "white". However, most white horses have pink skin and some have blue eyes. A horse with dark skin and dark eyes under a white hair coat is gray. However, a gray horse with an underlying homozygous cream base coat color may be born with rosy-pink skin, blue eyes and near-white ...