Sire Gray Buckskin on dam Bay
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Buckskin and a mare 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 Gray Buckskin. Genetically, it presents the base genotype E/_ A/_ Cr/n 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 Buckskin.
On the other side, the mare Bay contributes with its genetics based on E/_ A/_. Brown body with black mane, tail, lower legs and ear tips, due to the presence of black pigment restricted to the points by the Agouti gene.
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 Buckskin. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/n G/n, E/E A/A Cr/n G/G, E/E A/a Cr/n G/n, E/E A/a Cr/n G/G, E/e A/A Cr/n G/n, E/e A/A Cr/n G/G, E/e A/a Cr/n G/n, E/e A/a Cr/n G/G.
As for the dam, being Bay, may present in its DNA the alleles: E/e A/a, E/e A/A, E/E A/a, E/E A/A.
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).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Gray Buckskin with genotype (E/E A/A Cr/n 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, restricting black pigment to the extremities and has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Buckskin with genotype (E/E A/A Cr/n 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, restricting black pigment to the extremities and has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Grey allele (G).
Being the sire Gray Buckskin with genotype (E/E A/a Cr/n G/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 has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Buckskin with genotype (E/E A/a Cr/n G/G), 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 always transmits the Grey allele (G).
Being the dam Bay 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 (restriction) to 50% and the (a) allele (no restriction) to the other 50%.
Being the dam Bay 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, restricting black pigment to the extremities.
Being the dam Bay 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 (restriction) to 50% and the (a) allele (no restriction) to the other 50%.
Being the dam Bay 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, restricting black pigment to the extremities.
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray BuckskinOpen Coat ➜ 19,6%
BuckskinOpen Coat ➜ 19,6%
Gray BayOpen Coat ➜ 17,6%
BayOpen Coat ➜ 17,6%
Gray PalominoOpen Coat ➜ 3,5%
PalominoOpen Coat ➜ 3,5%
Gray ChestnutOpen Coat ➜ 3,5%
ChestnutOpen Coat ➜ 3,5%
Gray Dark BrownOpen Coat ➜ 2,0%
Dark BrownOpen Coat ➜ 2,0%
Gray Smoky BlackOpen Coat ➜ 1,9%
Smoky BlackOpen Coat ➜ 1,9%
Gray BlackOpen Coat ➜ 1,9%
BlackOpen Coat ➜ 1,9%
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