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All dun horses possess at least the dorsal stripe, [1] [2] [3] but the presence of the other primitive markings varies. Other common markings may include horizontal striping on the legs, transverse striping across the shoulders, and lighter guard hairs along the edges of a dark mane and tail.
A palomino that also carries dun, showing primitive dorsal striping or leg bars indicative of a red dun may be called a "dunalino." Countershading such as light dorsal stripes resulting from the presence of the gene nd1 (see section below) may be difficult to detect on light-colored horses.
Grullo [1] (pronounced GREW-yo) [2] [a] or grulla is a color of horses in the dun family, characterized by tan-gray or mouse-colored hairs on the body, often with shoulder and dorsal stripes and black barring on the lower legs. The genotype for grulla horses is a black base with dun dilution. In this coloration, each individual hair is mouse ...
Dun horses may have primitive markings, which include any of the following: a dorsal stripe, lightened outer guard hairs on the manes and/or tails, zebra-like stripes on the upper legs, transverse striping over the upper shoulders, dark color around the muzzle, and ears with dark outlines and lighter interiors. [3]
Dun: A horse coat color that features primitive markings: a slightly darker hair shade from the base coat located in a dorsal stripe along the horse's backbone, horizontal striping on the upper legs and sometimes transverse striping across the shoulders. These markings identify a horse as a dun as opposed to a buckskin or a bay.
Heck horses are dun or grullo (a dun variant) in color, with occasional white markings. The breed has primitive markings , including a dorsal stripe and horizontal striping on the legs. However, they lack the erect manes of primitive equines including tarpans.
Buckskins should not be confused with dun-colored horses, which have the dun dilution gene, not the cream gene. Duns always have primitive markings (shoulder blade stripes, dorsal stripe, zebra stripes on legs, webbing). However, it is possible for a horse to carry both dilution genes; these are called "buckskin duns" or sometimes "dunskins."
A dilution gene that produces what looks like point coloration, but from a completely different genetic mechanism is the dominant Dun gene, which dilutes the color of the body coat but not the points, including primitive markings—a dorsal stripe down the back and, less often, horizontal striping on the upper legs. On a bay base coat the dun ...