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The dun gene is a dilution gene that affects both red and black pigments in the coat color of a horse. The dun gene lightens most of the body while leaving the mane , tail, legs, and primitive markings the shade of the undiluted base coat color.
Grulla, or Blue Dun: A horse with a black base color and the dun gene. Coat is a solid "mouse-colored" gray or silver (can also be almost brownish-gray) with black or dark gray primitive markings. Red Dun: A chestnut base coat with dun factors. Coat is usually pale yellow or tan with chestnut (red) primitive markings.
Visually, the horse may be bay dun, grullo, red dun, palomino dun, amber dun, gray, and so on. Such a horse will always pass on the D allele and will therefore always have dun offspring. D/d (+/d, D + /D d) wildtype, heterozygous. Visually indistinguishable from the homozygous D horse. d/d (D d /D d) non-dun, homozygous recessive. The entire ...
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.
Kiger mustangs are most commonly dun in color, although the breed registry also allows bay, black and roan horses to be registered. There are numerous shades of dun, all variations on a tan base, and many shades have their own names. The Kiger Mesteño Association separates dun shades into four categories: dun, red dun, grulla, and claybank.
The Przewalski's horse is dun-colored with primitive markings. So, too, are horse breeds such as the Konik and the Heck horse, "bred back" to resemble the now-extinct tarpan, many of which are grullo or mouse dun in color. Every dun horse has a dorsal stripe, and some dun horses also have additional primitive markings.
Horses with both the champagne gene and the dun gene are also well-recorded. The dun gene is responsible for flat, diluted coat colors and vivid primitive markings. Bay dun is thought to be the wildtype horse coat color. Dun does not affect skin or eye color, but dilutes red pigment to yellow and black pigment to slate gray.
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.