There is a distinct allele that darkens a bay coat to seal brown (At), but it is not the cause of all forms of dark bay.
It is however used as a descriptive term especially in Quarter Horses. Such horses are called seal brown.
However the dorsal color should always be at least a shade darker than the body. Although most dun horses will have at least some of these markings their intensity can vary greatly. A classic "bay dun" is a gray-gold or tan, characterized by a body color ranging from sandy yellow to reddish brown. Seal browns and very darkly countershaded browns can look almost identical and illustrate that occasionally it is difficult to assess a horse's genotype accurately by visual inspection of phenotype alone. Duns with a chestnut base may appear a light tan shade, and those with black base coloration are a steel gray.
All dun horses however, MUST have a dorsal stripe. Seal brown horses have a black base coat which is suppressed by the Agouti gene to produce the black points.
"The mealy effect generally is lighter and more yellow than residual nonblack areas (which tend to be redder) on very sooty horses.
Brown: The word "brown" is used by some breed registries to describe dark bays. The most common black dun coloration is the color of slate stone. It does not explain the genetics behind the colors. This is not technically correct as a true “Silver Grullo” would also carry Silver. "Sponenberg 2003. pg. The appearance of a horse's skin, eye, and coat-color is determined by pigment chemicals called The gene with the greatest role in the seal brown coat phenotype is Theories of the existence of additional alleles on the Agouti locus have been proposed, but have not been verified. This guide is written to help identify horse colors.
Other dun factor markings will be black as well. It is often not necessary to differentiate between bay dun and brown dun however, brown duns mistaken for black duns can be troubling for the breeder who is trying to produce black dun foals. Leg black may not be a true black but may be a brownish color that looks black from a distance. "Sponenberg 2003, pg 123. Brown duns will almost always have a facemask and their leg black will often come above the knees whereas bay duns will often lack a face mask and will have lower leg black. These are An early version of the currently-accepted equine Agouti gene theory was first presented in 1951 by Miguel Odriozola in For a period, the seal brown phenotype - black or near-black coat with tan or red hairs on the soft areas - was described as a true This theory was discarded when the equine Agouti gene (ASIP) was sequenced in 2001, finding all horses fitting the seal brown phenotype did not possess the homozygous recessive The allure of a pure black coat on a horse has struck horse breeders for centuries, resulting in all-black breeds like the To account for this, W.E. A red dun Quarter Horse donated by Rochelle of [url=http://silverdust.wix.com/silverdustarabians]Silverd…
These horses are often mistaken for seal browns or dark bays.
This is a very common color for grullo foals. A face mask, if it is present, will be the same color as the other dun factor markings although bay duns are often found without a face mask. The classic Dun is a gray-gold or tan, characterized by a body color ranging from sandy yellow to reddish-brown. These markings are often referred to as “Dun Factor” markings. The term is not to be confused with "brown", which is used by some breed registries to refer to either a seal brown horse or to a dark bay without the additional characteristics of seal brown genetics. BACK IN STOCK JUNE 2020 Breyer by CollectA Breyer is thrilled to introduce Breyer by CollectA, a new line of horses, dogs, cats and farm animals for play and collecting. Among horse aficionados, a common assessment is that "...[the term] is only used by people with one horse or with two hundred. Dun horses always have a dark stripe down the middle of their back, a tail and mane darker than the body coat, and usually darker faces and legs From the Ultimate Horse Site website: Brown duns foals will most often be born a very similar color to bay dun whereas black dun foals are most often born a very distinctive beige color. The dorsal stripe, leg bars and cobwebbing can be dark red, brown or black. The general rule is that a dun dorsal will be crisp and present all year round while a countershaded dorsal will likely have a “smudged” look and it’s intensity may vary with the seasons (to read more about the difference see This color will generally be a light chestnut with a dorsal stripe, leg bars and sometimes cobwebbing. Castle postulated that there was a third allele at the Both theories were laid to rest after the characterization of the equine Many black horses fade, sunbleach, or otherwise undergo a lightening of their coat color with exposure to sunlight and sweat. A very dark black dun is sometimes called Lobo Dun and can be almost black in appearance but these are quite rare. "In the most simple terms, the vast majority of horses are indeed some shade of brown, but not "seal brown." Often foal pics can be helpful in distinguishing brown dun from black dun (grullo) foals. Black Duns can range from a very light silver color to almost black. 9.10. "Sponenberg 2003, pg 24.
Such coat colors include:
Black dun foals are often born a beige color with or without a face mask. These adorable, authentic miniatures have been sculpted by experts to achieve the most realistic … Features Brown Dun Fjord Stallion Model Horse; 1:18th scale model horse measures approximately 5.7" long x 4.7" tall; Safe, virtually unbreakable with realistic look; Sculpted by Deborah McDermott; Hand crafted in vinyl and hand-painted >
The presence of other coat color genes can modify a seal brown coat.
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