Sire Roan Bay on dam Paint Dark Brown
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Roan Bay and a mare Paint Dark Brown. Equine genetics is a universe of combinations where dominant and recessive alleles determine the final coat of each individual.
On one side, we have the stallion Roan Bay. Genetically, it presents the base genotype E/_ A/_ Rn/n. The (Rn) gene acts on the base coat by distributing white hairs throughout the body, giving it a roan appearance. The head and legs retain the original base color tones. This coat is based on Bay.
On the other side, the mare Paint Dark Brown contributes with its genetics based on E/_ A/_ To/n. The (To) gene acts on the base coat forming large, well-defined white patches across the body and legs. Many cases also inherit blue eyes. This coat is based on Dark Brown.
Quando combinamos esses códigos genéticos, criamos uma matriz de probabilidades. É importante lembrar que o resultado visual (fenótipo) muitas vezes esconde genes recessivos que podem pular uma geração.
The Genotypes Involved
For a horse to have the coat Roan Bay. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a Rn/n, E/e A/a Rn/Rn, E/e A/A Rn/n, E/e A/A Rn/Rn, E/E A/a Rn/n, E/E A/a Rn/Rn, E/E A/A Rn/n, E/E A/A Rn/Rn.
As for the dam, being Paint Dark Brown, may present in its DNA the alleles: E/e A/a To/n, E/e A/a To/To, E/e A/A To/n, E/e A/A To/To, E/E A/a To/n, E/E A/a To/To, E/E A/A To/n, E/E A/A To/To.
Understanding the Alleles
To understand the result of this crossing, note the gene sets at play:
- E/ (Extension - Dominant): The Extension gene controls eumelanin (black) production. At least one E allele allows the horse to have black hairs.
- A/ (Agouti - Dominant): The Agouti gene controls black distribution. The A allele restricts black pigment to the points (mane, tail, legs).
- To/ (Tobiano): Dominant gene for vertical white patches crossing the back.
- Rn/ (Roan - Rosilho): Mixes white hairs throughout the body, keeping head and extremities in the original color.
Calculated Probabilities
Being the sire Roan Bay with genotype (E/e A/a Rn/n), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Bay with genotype (E/e A/a Rn/Rn), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and always transmits the Roan allele (Rn).
Being the sire Roan Bay with genotype (E/e A/A Rn/n), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Bay with genotype (E/e A/A Rn/Rn), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and always transmits the Roan allele (Rn).
Being the dam Paint Dark Brown with genotype (E/e A/a To/n), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and has a 50% chance of transmitting the Tobiano allele (To).
Being the dam Paint Dark Brown with genotype (E/e A/a To/To), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and always transmits the Tobiano allele (To).
Being the dam Paint Dark Brown with genotype (E/e A/A To/n), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and has a 50% chance of transmitting the Tobiano allele (To).
Being the dam Paint Dark Brown with genotype (E/e A/A To/To), it transmits the (E) allele (black factor) to 50% and the (e) allele (red factor) to the other 50% and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and always transmits the Tobiano allele (To).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint Roan BayOpen Coat ➜ 16,7%
Paint BayOpen Coat ➜ 16,7%
Roan BayOpen Coat ➜ 16,7%
BayOpen Coat ➜ 16,7%
Paint Roan ChestnutOpen Coat ➜ 3,3%
Paint ChestnutOpen Coat ➜ 3,3%
Roan ChestnutOpen Coat ➜ 3,3%
ChestnutOpen Coat ➜ 3,3%
Paint Roan Dark BrownOpen Coat ➜ 2,9%
Paint Dark BrownOpen Coat ➜ 2,9%
Roan Dark BrownOpen Coat ➜ 2,9%
Dark BrownOpen Coat ➜ 2,9%
Paint Roan BlackOpen Coat ➜ 2,1%
Paint BlackOpen Coat ➜ 2,1%
Roan BlackOpen Coat ➜ 2,1%
BlackOpen Coat ➜ 2,1%
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