frame overo grullo
frame overo souris
in this cross
Description
Slate-grey to mouse-grey body with black mane, tail, and lower legs. The Dun gene dilutes the black base and adds primitive wild-horse markings: dorsal stripe, leg barring, sometimes shoulder stripes. Also called grulla or blue dun.
Visual traits
Slate-grey body · Black mane, tail, and lower legs · Primitive markings (dorsal stripe, leg barring) · Brown eyes
Genetic basis
Extension E/-, Agouti a/a, Dun nDn — Dun dilution on a black base produces the characteristic mouse-grey.
The Frame Overo pattern adds irregular white patches to the base coat. Crossing two Frame horses is dangerous: 25% of foals will be homozygous O/O (OLWS) and will not survive.