The agouti gene "A" restricts the black color to the points: mane, tail and legs. This creates the color we call "bay."
It is a very common gene, and is dominant, so very few breeds are free of it.
At this time it is believed that its effect cannot be seen on a red horse; at any rate, a red horse has no black pigment for it to affect.
Bay can range from such a light almost tan color that could be mistaken for buckskin or dun, to a nearly black that looks just like a seal brown.
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