Sire Gray Bay on dam Dark Brown
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Bay and a mare Dark Brown. 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 Dark Brown contributes with its genetics based on E/_ A/_. Dark brown coat, often nearly black, with black points, expressed over the bay base.
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 Dark Brown, 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).
- 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 Dark Brown 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 Dark Brown 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 Dark Brown 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 Dark Brown 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 BayOpen Coat ➜ 33,3%
BayOpen Coat ➜ 33,3%
Gray ChestnutOpen Coat ➜ 6,6%
ChestnutOpen Coat ➜ 6,6%
Gray Dark BrownOpen Coat ➜ 5,9%
Dark BrownOpen Coat ➜ 5,9%
Gray BlackOpen Coat ➜ 4,2%
BlackOpen Coat ➜ 4,2%
Want absolute precision?
Genetics is detailed. Knowing whether the animal is Homozygous or Heterozygous completely changes the result. You can run 100% precise simulations by filtering according to the exact genotype of your animal in our App.
Open Rancholi Simulator