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The dun gene, when on a "bay dun" horse, can closely resemble buckskin, in that both colors feature a light-colored coat with a dark mane and tail. In particular, buckskins with non-dun 1 primitive markings can easily be confused with dun. [11]: 32 Genetically, a bay dun is a bay horse with
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 ...
Every dun horse has a dorsal stripe, and some dun horses also have additional primitive markings. Some non-dun horses may also show primitive markings, namely newborn foals and horses with the non-dun 1 gene. [1] [4] Primitive markings in horses are an example of atavism: preservation of or reversion to ancestral type.
Some were non-dun with primitive markings, and non-dun 1 is one of the oldest coat color mutations, and has been found in remains from 42,700 years ago, along with dun. Non-dun 2, the version of the dun gene that most domestic horses have, is thought to be much more recent, possibly from after domestication. [3]
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 ...
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.
Blue dun or grullo (also grulla, mouse dun) coloring is created by the dun gene acting on a black base coat, and is a coat color with a bluish cast and darker points. [13] Unlike blue roans, grullos are solid color and appear bluish due to low amounts of pigment in each hair, not interspersed white hairs. [ 14 ]
Non-dun 1 replaces the tan dun color with the darker brown of bay, but keeps the primitive markings seen on dun. Later a second mutation to the dun gene, called non-dun 2, was able to remove the primitive markings altogether to create the non-striped bay color common today. [7] [8]