Sire Gray Black on dam Splash White Chestnut
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Black and a mare Splash White Chestnut. 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 Gray Black. Genetically, it presents the base genotype E/_ a/a G/n. The (G) gene acts on the base coat promoting progressive lightening throughout the horse's life until reaching very pale or completely white tones. This coat is based on Black.
On the other side, the mare Splash White Chestnut contributes with its genetics based on e/e 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 Chestnut.
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 Gray Black. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a G/n, E/e a/a G/G, E/E a/a G/n, E/E a/a G/G.
As for the dam, being Splash White Chestnut, 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.
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/).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
- Sw2/ (Splash White): Manchas brancas que sobem das partes inferiores do cavalo, frequentemente associadas a olhos azuis.
Calculated Probabilities
Being the sire Gray Black with genotype (E/e a/a G/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 Grey allele (G).
Being the sire Gray Black with genotype (E/e a/a G/G), 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 always transmits the Grey allele (G).
Being the sire Gray Black with genotype (E/E a/a G/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 Grey allele (G).
Being the sire Gray Black with genotype (E/E a/a G/G), 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 always transmits the Grey allele (G).
Being the dam Splash White Chestnut with genotype (e/e A/A 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 tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Chestnut with genotype (e/e A/A 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 sempre transmite o alelo Splash White (Sw2).
Being the dam Splash White Chestnut with genotype (e/e A/a 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 tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the dam Splash White Chestnut with genotype (e/e A/a 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 sempre transmite o alelo Splash White (Sw2).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray Splash White BayOpen Coat ➜ 8,8%
Splash White BayOpen Coat ➜ 8,8%
Gray BayOpen Coat ➜ 8,8%
BayOpen Coat ➜ 8,8%
Gray Splash White ChestnutOpen Coat ➜ 8,8%
Splash White ChestnutOpen Coat ➜ 8,8%
Gray ChestnutOpen Coat ➜ 8,8%
ChestnutOpen Coat ➜ 8,8%
Gray Splash White BlackOpen Coat ➜ 6,5%
Splash White BlackOpen Coat ➜ 6,5%
Gray BlackOpen Coat ➜ 6,5%
BlackOpen Coat ➜ 6,5%
Gray Splash White Dark BrownOpen Coat ➜ 1,0%
Splash White Dark BrownOpen Coat ➜ 1,0%
Gray Dark BrownOpen Coat ➜ 1,0%
Dark BrownOpen Coat ➜ 1,0%
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