Sire Chestnut on dam Paint Smoky Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Chestnut and a mare Paint Smoky Black. 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 Smoky Black contributes with its genetics based on E/_ a/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 Smoky Black.
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 Smoky Black, 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.
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 Smoky Black with genotype (E/e a/a Cr/n 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, allowing black to spread in homozygosis (if Extension is present) 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 Smoky Black with genotype (E/e a/a Cr/n 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, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Tobiano allele (To).
Being the dam Paint Smoky Black 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, allowing black to spread in homozygosis (if Extension is present) 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 Smoky Black 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, allowing black to spread in homozygosis (if Extension is present) 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 ➜ 9,8%
BuckskinOpen Coat ➜ 9,8%
Paint BayOpen Coat ➜ 8,8%
BayOpen Coat ➜ 8,8%
Paint PalominoOpen Coat ➜ 8,8%
PalominoOpen Coat ➜ 8,8%
Paint ChestnutOpen Coat ➜ 8,8%
ChestnutOpen Coat ➜ 8,8%
Paint Smoky BlackOpen Coat ➜ 6,5%
Smoky BlackOpen Coat ➜ 6,5%
Paint BlackOpen Coat ➜ 6,5%
BlackOpen Coat ➜ 6,5%
Paint Dark BrownOpen Coat ➜ 1,0%
Dark BrownOpen 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