Learn about one of the tests we do: Splashed white 2/deafness

The splashed white 2 (SW2) 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. It is rare but possible for SW2 horses to be deaf.

Chestnut splashed white horses generally have larger markings than bay/brown or black splashed white horses.

The SW2 version of splashed white is only found horses descended from a Quarter Horse mare called Katie Gun, born in 1987 in the USA.

It is possible (though very rare) for horses to carry two copies of SW2.

Gene or region and technical reference

Gene: PAX3 (causative). Reference: Hauswirth et al. (2012)

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