Sire Roan Chestnut on dam Splash White Cremello
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Roan Chestnut and a mare Splash White Cremello. 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 Chestnut. Genetically, it presents the base genotype e/e 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 Chestnut.
On the other side, the mare Splash White Cremello contributes with its genetics based on e/e Cr/Cr Sw2/n. The gene (Sw1) acts on the base coat color and imparts well-defined white markings, mainly on the face and limbs. Many individuals inherit blue eyes. This coat is based on Cremello.
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 Chestnut. 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.
As for the dam, being Splash White Cremello, may present in its DNA the alleles: e/e A/A Cr/Cr Sw2/n, e/e A/A Cr/Cr Sw2/Sw2, e/e A/a Cr/Cr Sw2/n, e/e A/a Cr/Cr Sw2/Sw2, e/e a/a Cr/Cr Sw2/n, e/e a/a Cr/Cr Sw2/Sw2.
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).
- 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/Cr (Double Cream): Maximum dilution. Pink skin, blue eyes (e.g. Cremello, Perlino).
- Rn/ (Roan - Rosilho): Mixes white hairs throughout the body, keeping head and extremities in the original color.
- Sw2/ (Splash White): Manchas brancas que sobem das partes inferiores do cavalo, frequentemente associadas a olhos azuis.
Calculated Probabilities
Being the sire Roan Chestnut with genotype (e/e A/A Rn/n), 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 and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Chestnut with genotype (e/e A/A Rn/Rn), 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 and always transmits the Roan allele (Rn).
Being the sire Roan Chestnut with genotype (e/e A/a Rn/n), 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% and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Chestnut with genotype (e/e A/a Rn/Rn), 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% and always transmits the Roan allele (Rn).
Being the dam Splash White Cremello with genotype (e/e A/A Cr/Cr Sw2/n), 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 and always transmits the Cream dilution allele (Cr) and tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Cremello with genotype (e/e A/A Cr/Cr Sw2/Sw2), 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 and always transmits the Cream dilution allele (Cr) and sempre transmite o alelo Splash White (Sw2).
Being the dam Splash White Cremello with genotype (e/e A/a Cr/Cr Sw2/n), 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% and always transmits the Cream dilution allele (Cr) and tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Cremello with genotype (e/e A/a Cr/Cr Sw2/Sw2), 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% and always transmits the Cream dilution allele (Cr) and sempre transmite o alelo Splash White (Sw2).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Roan Splash White PalominoOpen Coat ➜ 25,0%
Splash White PalominoOpen Coat ➜ 25,0%
Roan PalominoOpen Coat ➜ 25,0%
PalominoOpen Coat ➜ 25,0%
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