Coat formed by the combined effect of Paint and Gray on the Dark Brown base.
Typical Genetic Formula
E/_ A/_ To/n G/n
Possible Genotype Variations
E/e A/a To/n G/n
E/e A/a To/n G/G
E/e A/a To/To G/n
E/e A/a To/To G/G
E/e A/A To/n G/n
E/e A/A To/n G/G
E/e A/A To/To G/n
E/e A/A To/To G/G
E/E A/a To/n G/n
E/E A/a To/n G/G
E/E A/a To/To G/n
E/E A/a To/To G/G
E/E A/A To/n G/n
E/E A/A To/n G/G
E/E A/A To/To G/n
E/E A/A To/To G/G
The Genetic Basis
For a horse to be born Paint Gray Dark Brown, it must receive the following combination from its parents:
- Its ability to express or produce black pigment indicates it received the dominant E allele from at least one parent.
- Gray does not skip generations. For this animal to be Gray, the sire or dam had to be Gray to provide the (Rn).
- The Tobiano patches that characterize the Paint Horse were inherited from at least one parent.
Understanding the Alleles
The horse Paint Gray Dark Brown has a specific combination of alleles. Below, we explain each genetic component that forms this coat:
- 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.
- To/ (Tobiano): Vertical white patches crossing the back.
- G/ (Grey): Progressive graying. Epistatic — covers all other colors.
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