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Ermine marks: The occurrence of black marks on a white marking, most often seen on leg markings just above the hoof. May cause the hoof to be striped. "Medicine hat": An unusual type of Pinto or Paint coloring where the horse has dark ears and poll (like a hat on the head), but surrounded on all sides of the head and neck by white. [5]
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.
[7] [13] [14] Without genetic testing, some carriers are misidentified as having white markings due to another gene, while some are even classified as solids. [3] The presence of this gene in a variety of horse populations in North America suggests that the mutation occurred in early American history, perhaps in a Spanish-type horse. [5] [6] [7]
If a horse carries both genes, it will show spotting patterns while young, but they will fade over time as the overall coat lightens to white. Once the horse has fully grayed, the pink skin beneath the original white markings will still exist, but may not be obvious unless the horse has a body-clipped hair coat or is wet.
Some characteristics of a Tovero colored horse include: Dark pigmentation around the ears, sometimes called a "Medicine Hat" or a "War bonnet" Dark pigmentation around the ears, expanding to cover the forehead and/or eyes. Isolated "shield" dark markings completely surrounded by white, particularly on the face or chest. One or both eyes blue.
The term "cropout" is today most closely associated with horses of American Quarter Horse breeding. [2] These horse are often registered as American Paint Horses, where the term usually refers to horses with overo coloring and whose parents were solid horses not registered with the APHA. [3] It may also refer to sabino-patterned horses. [1]
The most common usage refers to frame overo, but splashed white and sabino are also considered "overo". [2] [3] A horse with both tobiano and overo patterns is called tovero. Frame overo, splashed white, and sabino are three separate pinto patterns, genetically unrelated, that are grouped together under the name "overo".
In other contexts, "solid" may be used to describe a horse with no white markings. Medicine hat: An uncommon pattern, the poll and ears are dark, surrounded completely by white, a true "medicine hat" pinto or paint usually has a predominantly white body, sometimes with dark coloration by the flanks, chest, and above the eyes.