The
color grullo - pronounced (grew-yo) or grulla -
pronounced (grew-ya) is a diluted form of black with
dun factor. So, the black color is "modified"
by the dun gene. "Grulla" is the Spanish word
for a gray crane, which is a slate-gray colored
bird.
You can
find grullo or grulla definitions in the rule books
of many different registries, but here is the AQHA
definition:
Body
color smoky or mouse colored (not a mixture of black
and white hairs, but each individual hair is mouse
colored) Usually has a dorsal stripe, shoulder
striping or shadowing and black leg barring on lower
legs.
As
with everything, there are variations of the color
often referred to as the following:
SLATE grullo, SILVER grullo,
BLUE dun, BLACK dun, SILVER dun, or LOBO dun.
However, all of these shades are genetically based
on the same thing; the dun gene on top of a black
gene.
The grullo color in the quarter horse
is very rare and only about 0.7% of those registered
in the AQHA each year are grullo.
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