Coat formed by the combined effect of Gray and Roan on the Dark Brown base.
Typical Genetic Formula
E/_ A/_ G/n Rn/n
Possible Genotype Variations
E/e A/a G/n Rn/n
E/e A/a G/n Rn/Rn
E/e A/a G/G Rn/n
E/e A/a G/G Rn/Rn
E/e A/A G/n Rn/n
E/e A/A G/n Rn/Rn
E/e A/A G/G Rn/n
E/e A/A G/G Rn/Rn
E/E A/a G/n Rn/n
E/E A/a G/n Rn/Rn
E/E A/a G/G Rn/n
E/E A/a G/G Rn/Rn
E/E A/A G/n Rn/n
E/E A/A G/n Rn/Rn
E/E A/A G/G Rn/n
E/E A/A G/G Rn/Rn
The Genetic Basis
For a horse to be born Gray Roan 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.
- Since the Roan gene is dominant, at least one parent was necessarily Roan (Rn).
- Gray does not skip generations. For this animal to be Gray, the sire or dam had to be Gray to provide the (Rn).
Understanding the Alleles
The horse Gray Roan 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.
- G/ (Grey): Progressive graying. Epistatic — covers all other colors.
- Rn/ (Roan): aaaaaaaaaaaaaaaa
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