Sire Dark Brown on dam Roan Buckskin
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Dark Brown and a mare Roan Buckskin. 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 Dark Brown. Genetically, it presents the base genotype E/_ A/_. Dark brown coat, often nearly black, with black points, expressed over the bay base.
On the other side, the mare Roan Buckskin contributes with its genetics based on 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.
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 Dark Brown. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a, E/e A/A, E/E A/a, E/E A/A.
As for the dam, being Roan Buckskin, may present in its DNA the alleles: 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.
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).
- Rn/ (Roan - Rosilho): Mixes white hairs throughout the body, keeping head and extremities in the original color.
Calculated Probabilities
Being the sire Dark Brown with genotype (E/e A/a), 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%.
Being the sire Dark Brown with genotype (E/e A/A), 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.
Being the sire Dark Brown with genotype (E/E A/a), 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%.
Being the sire Dark Brown with genotype (E/E A/A), 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.
Being the dam 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 dam 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 dam 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 dam 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).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Roan BuckskinOpen Coat ➜ 19,6%
BuckskinOpen Coat ➜ 19,6%
Roan BayOpen Coat ➜ 17,6%
BayOpen Coat ➜ 17,6%
Roan PalominoOpen Coat ➜ 3,3%
PalominoOpen Coat ➜ 3,3%
Roan ChestnutOpen Coat ➜ 3,3%
ChestnutOpen Coat ➜ 3,3%
Roan Smoky BlackOpen Coat ➜ 2,1%
Smoky BlackOpen Coat ➜ 2,1%
Roan BlackOpen Coat ➜ 2,1%
BlackOpen Coat ➜ 2,1%
Roan Dark BrownOpen Coat ➜ 2,0%
Dark BrownOpen Coat ➜ 2,0%
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