frame overo red dun
frame overo alezan dun
in this cross
Description
Pattern of irregular white patches on a colored coat, with a colored "frame" remaining on the back. Patches typically invade the belly and sides but leave the back intact. This pattern is associated with lethal OLWS syndrome when homozygous.
Visual traits
Irregular white patches · Back often retains color · Blue eyes common · OLWS if O/O
Genetic basis
Frame Overo O/o — the EDNRB gene produces white patches; homozygous O/O = non-viable white foal (OLWS).
The Dun gene dilutes the base coat and adds primitive wild-horse markings: a dorsal stripe along the spine, leg barring, and sometimes shoulder stripes.