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SWO stands for Splashed White Overo - it is a recessive disorder

SWO is another coat pattern defect - it applies to patterns that determine white.  Embryos that receive two of these genes will not complete development and will abort in the womb.

Hearing loss is associated with White Patterned horses - horses white on the inside of the ear are affected - horses who's ears have pigmented hair inside the ear are not affected.

Splashed White 2 (SW2) and Splashed White 3 (SW3) are found Quarter Horses and related breeds.

Genetic Codes:

SW1/SW1 Homozygous Horse has two copies of the SW-1 mutation
N/SW1 Heterozygous Horse has one copy of the SW-1 mutation
N/N Negative No copies of SW-1 mutation
SW2/SW2 Homozygous Horse has two copies of the SW-2 mutation
N/SW2 Heterozygous Horse has one copy of the SW-2 mutation
N/N Negative No copies of SW-2 mutation
SW3/SW3 Homozygous Possible homozygous lethal
N/SW3 Heterozygous Horse has one copy of the SW-3 mutation
N/N Negative No copies of SW-3 mutation
SW4/SW4 Homozygous Possible homozygous lethal but no current information available
N/SW4 Heterozygous Horse has one copy of the SW-4 mutation
N/N Negative No copies of SW-4 mutation
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