The cross between a Gray Bay stallion, whose coat the (G) gene acts on the base coat promoting progressive lightening throughout the horse's life until reaching very pale or completely white tones. Brown body with black mane, tail, lower legs and ear tips, due to the presence of black pigment restricted to the points by the Agouti gene., and a Dun Dark Brown mare with coat the Dun gene acts on the base color, adding the characteristic dark dorsal stripe. In some cases it lightens the body tone and may also produce zebra-like leg markings. Dark brown coat, often nearly black, with black points, expressed over the bay base., can produce 16 different coat colors: Gray Dun Bay (17%), Dun Bay (17%), Gray Bay (17%), Bay (17%), Gray Dun Chestnut (3%), Dun Chestnut (3%), Gray Chestnut (3%), Chestnut (3%), Gray Dun Dark Brown (3%), Dun Dark Brown (3%), Gray Dark Brown (3%), Dark Brown (3%), Gray Dun Black (2%), Grullo (2%), Gray Black (2%) and Black (2%). Results vary according to the genotype of each parent — use the filters above to explore specific combinations.