Sire Chestnut on dam Paint Buckskin
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Chestnut and a mare Paint 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 Chestnut. Genetically, it presents the base genotype e/e. Base coat with a reddish body, mane and tail, with no black pigment.
On the other side, the mare Paint Buckskin contributes with its genetics based on E/_ A/_ Cr/n 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 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 Chestnut. 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.
As for the dam, being Paint Buckskin, may present in its DNA the alleles: E/E A/A Cr/n To/n, E/E A/A Cr/n To/To, E/E A/a Cr/n To/n, E/E A/a Cr/n To/To, E/e A/A Cr/n To/n, E/e A/A Cr/n To/To, E/e A/a Cr/n To/n, E/e A/a Cr/n To/To.
Understanding the Alleles
To understand the result of this crossing, note the gene sets at play:
- e/e (Red Factor - Homozygous Recessive): Determines the inability to produce black pigment, resulting in an exclusively red base coat (Chestnut).
- 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).
- a/a (Non-Agouti - Recessive): Allows black pigment to spread uniformly across the body. Essential for Solid Black (if E/).
- 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.
Calculated Probabilities
Being the sire Chestnut with genotype (e/e A/A), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities.
Being the sire Chestnut with genotype (e/e A/a), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50%.
Being the sire Chestnut with genotype (e/e a/a), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (a) allele to 100% of offspring, allowing black to spread in homozygosis (if Extension is present).
Being the dam Paint Buckskin with genotype (E/E A/A Cr/n To/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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/A Cr/n To/To), 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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/a Cr/n To/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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/a Cr/n To/To), 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 Tobiano allele (To).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint BuckskinOpen Coat ➜ 13,8%
BuckskinOpen Coat ➜ 13,8%
Paint BayOpen Coat ➜ 12,4%
BayOpen Coat ➜ 12,4%
Paint PalominoOpen Coat ➜ 9,4%
PalominoOpen Coat ➜ 9,4%
Paint ChestnutOpen Coat ➜ 9,4%
ChestnutOpen Coat ➜ 9,4%
Paint Smoky BlackOpen Coat ➜ 1,9%
Smoky BlackOpen Coat ➜ 1,9%
Paint BlackOpen Coat ➜ 1,9%
BlackOpen Coat ➜ 1,9%
Paint Dark BrownOpen Coat ➜ 1,4%
Dark BrownOpen Coat ➜ 1,4%
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