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[citation needed] Those on bay duns may be black or reddish, [5] while those on red duns are distinctly red. Dorsal stripes on dun horses with the cream gene seem unaffected by cream: smoky black-duns ("smoky grullas"), buckskin-duns ("dunskins"), and palomino-duns ("dunalinos") have black, brown, or red dorsal stripes, as well.
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.
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 ...
A red dun has a light reddish- tan body and dark red primitive markings and points. Red duns have a chestnut base coat with the dun gene (one or two copies). Their body color is pale, dusty tan shade that resembles the light undercoat color of a body-clipped chestnut but with a bold, dark dorsal stripe in dark red, a red mane, tail and legs.
Zebra stripes are visible on the left back leg. The dun gene also produces light guard hairs in the mane and the tail. 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 dun gene lightens some areas of the horse's coat, while leaving a darker dorsal stripe, mane, tail, face, and legs. Depending on whether it acts on a bay, black, or chestnut base coat, the dun gene produces the colors known as bay dun, grullo, and red dun.
Some bay horses have a faint dorsal stripe, which may be caused by the non-dun 1 allele. The oldest known horse coat color is bay dun, a tan color with a black mane, tail, dorsal stripe, and lower legs. The legs may sometimes have zebra-like black stripes; these, along with the dorsal stripe seen on all dun horses, are called primitive markings ...
These include the dorsal stripe, darker mane and tail, horizontal stripes on the back of the forearms, and, in rare cases, transverse striping across the withers. [5] Some horses have small brown spots on the body or the head. [3] These spots are called "Njal marks" after one of the foundation sires of the breed, who had such markings. [5]