Splashed white 3/deafness (SW3)
The splashed white 3 (SW3) gene causes white markings. They can range from minor facial markings and socks to the white face, blue eyes, white legs and white belly of a typical boldly marked splash horse. Most SW3 horses have fairly extensive markings. Like all splashed white horses, it is possible for SW3 horses to be deaf.
The SW3 version of splashed white has so far only been found in pure and part-bred Paints descended from TD Kid, a Paint stallion born in 2001 in the USA.
At this point there are no known instances of horses carrying two copies of SW3.
Gene or region and technical reference
Gene: MITF (causative). Reference: Hauswirth et al. (2012)
n. Test developed using manufactured DNA.
SW3. Test developed using manufactured DNA.