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Brown (AtAt
or Ata,
plus EE or
Ee)
 There
is now a DNA test to differentiate this color from bay or black. It's definitely a
separate and distinct color meriting a category of its own. The color is called
"black and tan" in some countries, which is an apt description. The
basic appearance is that of a black horse with tan highlights in
specific areas -- the muzzle, flanks, underbelly, and girth areas. The darkest
shades of seal brown would be almost all black except for a little tan at the
muzzle and flank, while the lighter ones look more like a tan horse with an
overlay of black covering a good deal of the body, and the very lightest shades
of seal brown might look very much like some bays. At one time a theory
was proposed that seal brown was caused by a solid black base color with a 'pangare'
gene, however, this theory was disproved when the a
allele was isolated and a test for it developed -- since none of the seal browns
that have been tested turned out to be aa,
they could not be "black plus" anything.
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Solfatara, a
brown TB mare owned at the time of this picture by William T.
Smith of Lexington, KY
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