(copied from wikipedia) Grulla 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.
Probably the only truly rare coat "color" is brindle. The occurance of this coat color pattern is so rare that there is still debate on how it is inherited.
If you click on the link to a breed's page, you'll see the coat rarity...percentages.Strawberry Roan is usually the rarest color, if it is available for the breed. Most breeds have the strawberry roan color available.To see the amount of horses that have each color coat, go to the Horses directory. =)
If you are speaking of equine coat colors, the answer is roan. Roan coloration comes in various varieties also. If the horse has deep red coloration with white mottling and a dark tail and mane, it is a called a bay roan (due to the dark tail and main). Many of these horses, when their hair is groomed off look sort of lavender in color. A true lavender roan is the rarest color of equine and will sport white hairs at the top of the tail and base of the mane as well. An all over mottled roan horse who looks brownish is called simply a roan and has a light brown Maine and tail. When the roan horse is light enough to look as though it has a pinkish color, it is called a strawberry roan. One interesting thing of note is that genetically a roan-to-roan breeding is genetically lethal to a horses off-spring. For Howrse Archimedes' question: Red Roan
Yes, it is! You can check in other places too.
Blue Roan Brindle is probably the rarest horse color.
A horse with a roan coat color has a mixture of white and colored hairs from birth that remain the same as it ages. Roan horses can have blue roan (dark coat with white hairs) or red roan (chestnut coat with white hairs) variations.
Cattle, horses, and dogs that have white hairs evenly intermixed with any other color is often called a roan. The Australian Cattle dog's mottled coat is actually a roan coat. The Blue Grey type of cattle often have a blue roan coat.
Roan is an example of incomplete dominance inheritance in cows and bulls. In this type of inheritance, the heterozygous individual will display a phenotype that is a mixture of the two homozygous genotypes. In the case of roan cattle, the roan color pattern is expressed when a black coat color allele and a red coat color allele are present.
its actually the coat roan, which has a mix of three colors, including white. the colors can be white roan, black roan, or even chestnut roan to have three colors. red roan only has reddish and white hairs, and there is no such thing as triskel or coffee-colored.
Roan is a coat color in horses that consists of a mix of white hairs intermingled with colored hairs. The colored hairs can be any base color, such as bay, chestnut, or black. The overall appearance of a roan horse is a blend of the base color and white hairs.
Roan does not affect a horses height in any way. Roan is simply a coat color modifier. A blue roan is just a black horse with the roan modifier.
A tricolored horse is called a paint. On howrse, i think the answer is a roan.
There may those who paint their pony blue, but it not a natural color for equines.