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Dún Briste (English: Dun Briste Sea Stack) is a natural sea stack or pilaster - in geomorphology called stack - that was formed in Ireland during the Carboniferous period, possibly Mississippian, approximately 350 million years ago.
Horses with the dominant D allele (D/D or D/d genotype) exhibit hypomelanism of the body coat, while d/d horses have otherwise intense, saturated coat colors. The mane, tail, head, legs, and primitive markings are not diluted. Zygosity for Dun can be determined with a DNA test. [27] The Dun locus is TBX3 on equine chromosome 8.
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 ...
Dun, also called bay dun, classic dun, or zebra dun is the most common type of dun, and has a tan or gold body with black mane, tail, and primitive markings. Genetically, the horse has an underlying bay coat color, acted upon by the dun gene.
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Less distinct primitive markings can also occur on non-dun horses, even in breeds which are not known to have any dun individuals. The most common primitive marking found is a dorsal stripe. [1] Most non-dun horses do not have darker primitive markings, but some do. This is because there are two types of non-dun, called non-dun1 and non-dun2.
"Dun" as used by the Kiger registry covers dun horses with black points, and adds the terms zebra dun, dusty dun, smutty dun or coyote dun, depending on the exact shade of body color. Red dun, or the variation "apricot dun", covers horses with points that are red, brown or flaxen .
These include the “blue dun” or grullo, which has a black base coat, and the red dun, which has a chestnut base coat. Similarly, darker coloration at the points is also preserved in horses with the roan gene , a patterning gene, producing a body coat of mingled white and dark hairs, but leaving the points the darker base color in all horses ...