The gene (Sw1) acts on the base coat color and imparts well-defined white markings, mainly on the face and limbs. Many individuals inherit blue eyes. This coat is based on Chestnut.
Typical Genetic Formula
e/e Sw2/n
Possible Genotype Variations
e/e A/A Sw2/n
e/e A/A Sw2/Sw2
e/e A/a Sw2/n
e/e A/a Sw2/Sw2
e/e a/a Sw2/n
e/e a/a Sw2/Sw2
The Genetic Basis
For a horse to be born Splash White Chestnut, it must receive the following combination from its parents:
- To have the red base (Chestnut), this animal necessarily inherited a recessive (e) allele from the sire and another from the dam. Both parents carried the red factor.
- The Splash White pattern was inherited from at least one parent carrying the (Sw2) allele.
Understanding the Alleles
The horse Splash White Chestnut has a specific combination of alleles. Below, we explain each genetic component that forms this coat:
- e/e (Red Factor): The animal has a fundamentally red base (Chestnut), due to the total absence of black pigment.
- A/ (Agouti): The Agouti gene, when active (with E present), restricts black pigment to the extremities. Carried with no visual effect in e/e animals.
- a/a (Non-Agouti): Allows black to spread over the entire body when combined with E. In e/e animals it is invisible but still passed on.
- Sw2/ (Splash White): White patches rising from the lower body, often associated with blue eyes.
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