Sire Roan Buckskin on dam Paint Bay
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Roan Buckskin and a mare Paint Bay. 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 Buckskin. Genetically, it presents the base genotype E/_ A/_ Cr/n 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 Buckskin.
On the other side, the mare Paint Bay 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 Bay.
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 Buckskin. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/n Rn/n, E/E A/A Cr/n Rn/Rn, E/E A/a Cr/n Rn/n, E/E A/a Cr/n Rn/Rn, E/e A/A Cr/n Rn/n, E/e A/A Cr/n Rn/Rn, E/e A/a Cr/n Rn/n, E/e A/a Cr/n Rn/Rn.
As for the dam, being Paint Bay, 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).
- Cr/n (Heterozygous Cream): One copy of the dilution allele. Lightens red pigment to gold (e.g. Palomino, Buckskin).
- 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 Buckskin with genotype (E/E A/A Cr/n Rn/n), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Buckskin with genotype (E/E A/A Cr/n Rn/Rn), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
Being the sire Roan Buckskin with genotype (E/E A/a Cr/n Rn/n), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) 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 Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Buckskin with genotype (E/E A/a Cr/n Rn/Rn), it transmits the (E) allele to 100% of offspring, enabling black pigment production (eumelanin) 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 Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
Being the dam Paint Bay 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 Bay 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 Bay 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 Bay 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 BuckskinOpen Coat ➜ 9,8%
Paint BuckskinOpen Coat ➜ 9,8%
Roan BuckskinOpen Coat ➜ 9,8%
BuckskinOpen Coat ➜ 9,8%
Paint Roan BayOpen Coat ➜ 8,8%
Paint BayOpen Coat ➜ 8,8%
Roan BayOpen Coat ➜ 8,8%
BayOpen Coat ➜ 8,8%
Paint Roan PalominoOpen Coat ➜ 1,8%
Paint PalominoOpen Coat ➜ 1,8%
Roan PalominoOpen Coat ➜ 1,8%
PalominoOpen Coat ➜ 1,8%
Paint Roan ChestnutOpen Coat ➜ 1,8%
Paint ChestnutOpen Coat ➜ 1,8%
Roan ChestnutOpen Coat ➜ 1,8%
ChestnutOpen Coat ➜ 1,8%
Paint Roan Dark BrownOpen Coat ➜ 1,0%
Paint Dark BrownOpen Coat ➜ 1,0%
Roan Dark BrownOpen Coat ➜ 1,0%
Dark BrownOpen Coat ➜ 1,0%
Paint Roan Smoky BlackOpen Coat ➜ 1,0%
Paint Smoky BlackOpen Coat ➜ 1,0%
Roan Smoky BlackOpen Coat ➜ 1,0%
Smoky BlackOpen Coat ➜ 1,0%
Paint Roan BlackOpen Coat ➜ 1,0%
Paint BlackOpen Coat ➜ 1,0%
Roan BlackOpen Coat ➜ 1,0%
BlackOpen Coat ➜ 1,0%
Want absolute precision?
Genetics is detailed. Knowing whether the animal is Homozygous or Heterozygous completely changes the result. You can run 100% precise simulations by filtering according to the exact genotype of your animal in our App.
Open Rancholi Simulator