Sire Roan Perlino on dam Splash White Dark Brown
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Roan Perlino and a mare Splash White Dark Brown. 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 Perlino. Genetically, it presents the base genotype E/_ A/_ Cr/Cr 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 Perlino.
On the other side, the mare Splash White Dark Brown contributes with its genetics based on E/_ A/_ 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 Dark Brown.
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 Perlino. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/Cr Rn/n, E/E A/A Cr/Cr Rn/Rn, E/E A/a Cr/Cr Rn/n, E/E A/a Cr/Cr Rn/Rn, E/e A/A Cr/Cr Rn/n, E/e A/A Cr/Cr Rn/Rn, E/e A/a Cr/Cr Rn/n, E/e A/a Cr/Cr Rn/Rn.
As for the dam, being Splash White Dark Brown, may present in its DNA the alleles: E/e A/a Sw2/n, E/e A/a Sw2/Sw2, E/e A/A Sw2/n, E/e A/A Sw2/Sw2, E/E A/a Sw2/n, E/E A/a Sw2/Sw2, E/E A/A Sw2/n, E/E A/A Sw2/Sw2.
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/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 Perlino with genotype (E/E A/A Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Perlino with genotype (E/E A/A Cr/Cr 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 always transmits the Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
Being the sire Roan Perlino with genotype (E/E A/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Perlino with genotype (E/E A/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
Being the dam Splash White Dark Brown with genotype (E/e A/a Sw2/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 tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Dark Brown with genotype (E/e A/a Sw2/Sw2), 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 sempre transmite o alelo Splash White (Sw2).
Being the dam Splash White Dark Brown with genotype (E/e A/A Sw2/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 tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Dark Brown with genotype (E/e A/A Sw2/Sw2), 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 sempre transmite o alelo Splash White (Sw2).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Roan Splash White BuckskinOpen Coat ➜ 19,6%
Splash White BuckskinOpen Coat ➜ 19,6%
Roan BuckskinOpen Coat ➜ 19,6%
BuckskinOpen Coat ➜ 19,6%
Roan Splash White PalominoOpen Coat ➜ 3,3%
Splash White PalominoOpen Coat ➜ 3,3%
Roan PalominoOpen Coat ➜ 3,3%
PalominoOpen Coat ➜ 3,3%
Roan Splash White Smoky BlackOpen Coat ➜ 2,1%
Splash White Smoky BlackOpen Coat ➜ 2,1%
Roan Smoky BlackOpen Coat ➜ 2,1%
Smoky BlackOpen Coat ➜ 2,1%
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