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Genetically, the horse has an underlying chestnut coat color, acted upon by the dun gene. Thus, as there is no black on the horse to be affected, the undiluted underlying color is red. [6] [7] Grullo or grulla, also called blue dun or mouse dun, is a smoky, blue-gray to mouse-brown color and can vary from light to dark. They consistently have ...
The dun gene lightens some areas of the horse's coat, while leaving a darker dorsal stripe, mane, tail, face, and legs. Depending on whether it acts on a bay, black, or chestnut base coat, the dun gene produces the colors known as bay dun, grullo, and red dun.
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.
A Heck horse. In terms of equine coat color genetics, all of these shades are based on the dun gene acting as a dilution gene over the black gene. Because the grulla color is not due to the gray gene, a grulla horse remains the same basic color from birth, though some minor shade variation may occur from summer to winter coats. If a grulla also ...
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.
The coat is generally characterized by the expression of the Dun gene (which includes the bay dun and grullo coats), with black manes and markings, [3] but a wide variety of other coats are possible, including chestnut, bay in all shades, black, gray, roan, strawberry roan, palomino [3] and piebald. [1] [16]
Cream dun, cremello dun or linebacked cremello: a blue-eyed cream horse also carrying the dun gene. The primitive markings associated with the dun color are usually quite visible, especially on horses with a bay or black base coat. Smoky grulla, silver grulla or smoky black dun: a
Dun gene describes another common dilution gene in horses; Champagne gene, describes a different dilution gene in horses that also creates cream coloring, pale skin with mottling and light-colored eyes. Pearl gene, also called the "Barlink factor", is a recessive gene. One copy of the allele has no effect on the coat color of black, bay or ...