Sire Black on dam Splash White Cremello
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Black 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 Black. Genetically, it presents the base genotype E/_ a/a. Entirely black coat, with no dilutions and no Agouti gene action restricting black pigment to the points.
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 Black. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a, E/E a/a.
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).
- 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/Cr (Double Cream): Maximum dilution. Pink skin, blue eyes (e.g. Cremello, Perlino).
- Sw2/ (Splash White): Manchas brancas que sobem das partes inferiores do cavalo, frequentemente associadas a olhos azuis.
Calculated Probabilities
Being the sire Black 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, allowing black to spread in homozygosis (if Extension is present).
Being the sire Black 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, allowing black to spread in homozygosis (if Extension is present).
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:
Splash White BuckskinOpen Coat ➜ 19,5%
BuckskinOpen Coat ➜ 19,5%
Splash White PalominoOpen Coat ➜ 17,5%
PalominoOpen Coat ➜ 17,5%
Splash White Smoky BlackOpen Coat ➜ 13,0%
Smoky BlackOpen Coat ➜ 13,0%
Want absolute precision?
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