Sire Buckskin on dam Splash White Bay
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Buckskin and a mare Splash White Bay. 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 Buckskin. Genetically, it presents the base genotype E/_ A/_ Cr/n. Golden cream coat with black mane, tail and legs, resulting from a single cream gene dilution over the bay base.
On the other side, the mare Splash White Bay 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 Bay.
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 Buckskin. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/n, E/E A/a Cr/n, E/e A/A Cr/n, E/e A/a Cr/n.
As for the dam, being Splash White Bay, 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/n (Heterozygous Cream): One copy of the dilution allele. Lightens red pigment to gold (e.g. Palomino, Buckskin).
- Sw2/ (Splash White): Manchas brancas que sobem das partes inferiores do cavalo, frequentemente associadas a olhos azuis.
Calculated Probabilities
Being the sire Buckskin with genotype (E/E A/A Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the sire Buckskin with genotype (E/E A/a Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the sire Buckskin with genotype (E/e A/A Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the sire Buckskin with genotype (E/e A/a Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the dam Splash White Bay 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 Bay 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 Bay 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 Bay 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:
Splash White BuckskinOpen Coat ➜ 19,6%
BuckskinOpen Coat ➜ 19,6%
Splash White BayOpen Coat ➜ 17,6%
BayOpen Coat ➜ 17,6%
Splash White PalominoOpen Coat ➜ 3,5%
PalominoOpen Coat ➜ 3,5%
Splash White ChestnutOpen Coat ➜ 3,5%
ChestnutOpen Coat ➜ 3,5%
Splash White Dark BrownOpen Coat ➜ 2,0%
Dark BrownOpen Coat ➜ 2,0%
Splash White Smoky BlackOpen Coat ➜ 1,9%
Smoky BlackOpen Coat ➜ 1,9%
Splash White BlackOpen Coat ➜ 1,9%
BlackOpen Coat ➜ 1,9%
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