The dun dilution lightens the coat color of horses. It affects both red and black pigment, but has less effect on the points of the horse. It also causes primitive markings.
Colors
Chestnut dun
Chestnut dun (also called claybank or red dun) is a horse color caused by the dun dilution on a chestnut base. The coat is diluted, and primitive markings are present.
Hannelore Roodhooft
Black dun
Black dun (also called grullo or mouse/blue dun) is a horse color caused by the dun dilution on a black base. The coat is diluted, and primitive markings are present.
Hannelore Roodhooft
Bay dun
Bay dun (also called classis or zebra dun) is a horse color caused by the dun dilution on a bay base. The coat is diluted, and primitive markings are present.
Hannelore Roodhooft
Gene
TBX3 gene
The TBX3 gene is responsible for the dilution dun and non-dun1.
Hannelore Roodhooft
Presence in horses
Dun is the original or wild type color of all horses. The lack of dun is, however, more common in horse breeds today. Some breeds, like the Fjord Horse, are almost exclusively dun in color.
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