Grullo 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. In this coloration each individual hair is mouse-colored, unlike a roan which is composed of a mixture of dark and light hairs. There are several shades of grullo, informally referred to with a variety of terms including black dun, blue dun, slate grullo, silver gr...
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Grullo 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. In this coloration each individual hair is mouse-colored, unlike a roan which is composed of a mixture of dark and light hairs. There are several shades of grullo, informally referred to with a variety of terms including black dun, blue dun, slate grullo, silver grullo, silver dun, or lobo dun. In the Icelandic horse, the grullo color is called "grey dun," and in the Fjord horse, Norwegian,"grå" or "gråblakk" (literally, "gray dun").
The word grullo originates from the Spanish word "grulla", which refers to a slate-gray crane. Because of the Spanish origin of the name, some people will refer to a mare as a grulla and a stallion or gelding as a grullo, pronounced "grew-ya" and "grew-yo" respectively.
In terms of equine coat color genetics, all of these shades are based on the dun gene acting as a...
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