Sire Dark Brown on dam Bay
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Dark Brown 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 Dark Brown. Genetically, it presents the base genotype E/_ A/_. Dark brown coat, often nearly black, with black points, expressed over the bay base.
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 Dark Brown. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a, E/e A/A, E/E A/a, E/E A/A.
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).
Calculated Probabilities
Being the sire 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 sire 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 sire 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 sire 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.
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:
BayOpen Coat ➜ 66,6%
ChestnutOpen Coat ➜ 13,1%
Dark BrownOpen Coat ➜ 11,8%
BlackOpen Coat ➜ 8,5%
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.
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