Sire Gray Bay on dam Paint Buckskin
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Bay and a mare Paint Buckskin. 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 Bay. Genetically, it presents the base genotype E/_ 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 Bay.
On the other side, the mare Paint Buckskin contributes with its genetics based on E/_ A/_ Cr/n To/n. The (To) gene acts on the base coat forming large, well-defined white patches across the body and legs. Many cases also inherit blue eyes. This coat is based on Buckskin.
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 Bay. 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, 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 Paint Buckskin, may present in its DNA the alleles: E/E A/A Cr/n To/n, E/E A/A Cr/n To/To, E/E A/a Cr/n To/n, E/E A/a Cr/n To/To, E/e A/A Cr/n To/n, E/e A/A Cr/n To/To, E/e A/a Cr/n To/n, E/e A/a Cr/n To/To.
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).
- To/ (Tobiano): Dominant gene for vertical white patches crossing the back.
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Gray Bay 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 (restriction) to 50% and the (a) allele (no restriction) to the other 50% and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Bay 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 (restriction) to 50% and the (a) allele (no restriction) to the other 50% and always transmits the Grey allele (G).
Being the sire Gray Bay 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, restricting black pigment to the extremities and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Bay 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, restricting black pigment to the extremities and always transmits the Grey allele (G).
Being the dam Paint Buckskin with genotype (E/E A/A Cr/n To/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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/A Cr/n To/To), 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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/a Cr/n To/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 Tobiano allele (To).
Being the dam Paint Buckskin with genotype (E/E A/a Cr/n To/To), 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 Tobiano allele (To).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint Gray BuckskinOpen Coat ➜ 9,8%
Paint BuckskinOpen Coat ➜ 9,8%
Gray BuckskinOpen Coat ➜ 9,8%
BuckskinOpen Coat ➜ 9,8%
Paint Gray BayOpen Coat ➜ 8,8%
Paint BayOpen Coat ➜ 8,8%
Gray BayOpen Coat ➜ 8,8%
BayOpen Coat ➜ 8,8%
Paint Gray PalominoOpen Coat ➜ 1,8%
Paint PalominoOpen Coat ➜ 1,8%
Gray PalominoOpen Coat ➜ 1,8%
PalominoOpen Coat ➜ 1,8%
Paint Gray ChestnutOpen Coat ➜ 1,8%
Paint ChestnutOpen Coat ➜ 1,8%
Gray ChestnutOpen Coat ➜ 1,8%
ChestnutOpen Coat ➜ 1,8%
Paint Gray Dark BrownOpen Coat ➜ 1,0%
Paint Dark BrownOpen Coat ➜ 1,0%
Gray Dark BrownOpen Coat ➜ 1,0%
Dark BrownOpen Coat ➜ 1,0%
Paint Gray Smoky BlackOpen Coat ➜ 1,0%
Paint Smoky BlackOpen Coat ➜ 1,0%
Gray Smoky BlackOpen Coat ➜ 1,0%
Smoky BlackOpen Coat ➜ 1,0%
Paint Gray BlackOpen Coat ➜ 1,0%
Paint BlackOpen Coat ➜ 1,0%
Gray BlackOpen Coat ➜ 1,0%
BlackOpen Coat ➜ 1,0%
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