Sire Splash White Buckskin on dam Splash White Bay
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Splash White 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 Splash White Buckskin. Genetically, it presents the base genotype E/_ A/_ Cr/n 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 Buckskin.
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 Splash White Buckskin. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/n Sw2/n, E/E A/A Cr/n Sw2/Sw2, E/E A/a Cr/n Sw2/n, E/E A/a Cr/n Sw2/Sw2, E/e A/A Cr/n Sw2/n, E/e A/A Cr/n Sw2/Sw2, E/e A/a Cr/n Sw2/n, E/e A/a Cr/n Sw2/Sw2.
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 Splash White Buckskin with genotype (E/E A/A Cr/n Sw2/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) and tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the sire Splash White Buckskin with genotype (E/E A/A Cr/n Sw2/Sw2), 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) and sempre transmite o alelo Splash White (Sw2).
Being the sire Splash White Buckskin with genotype (E/E A/a Cr/n Sw2/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) and tem 50% de chance de transmitir o alelo Splash White (Sw2).
Being the sire Splash White Buckskin with genotype (E/E A/a Cr/n Sw2/Sw2), 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) 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 (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 ➜ 29,3%
Splash White BayOpen Coat ➜ 26,4%
BuckskinOpen Coat ➜ 9,8%
BayOpen Coat ➜ 8,8%
Splash White PalominoOpen Coat ➜ 5,3%
Splash White ChestnutOpen Coat ➜ 5,3%
Splash White Dark BrownOpen Coat ➜ 2,9%
Splash White Smoky BlackOpen Coat ➜ 2,9%
Splash White BlackOpen Coat ➜ 2,9%
PalominoOpen Coat ➜ 1,8%
ChestnutOpen Coat ➜ 1,8%
Dark BrownOpen Coat ➜ 1,0%
Smoky BlackOpen Coat ➜ 1,0%
BlackOpen Coat ➜ 1,0%
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