Dun Morgan Color Reference Dun is a dilution gene that lightens both red and black hair on the horse's body. It is also associated with primitive markings, which generally include a dorsal stripe and leg barring, and may also consist of dun colored frosting on the sides of the mane and at the tailhead, dorsal barbs, cobwebbing, white ear tips and barring on the ears, and a facial mask of darker hair. Because dun is a dominant gene, all dun horses have at least one dun parent.

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