Sire Paint Bay on dam Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Paint Bay and a mare Black. 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 Paint Bay. Genetically, it presents the base genotype E/_ A/_ 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 Bay.
On the other side, the mare Black contributes with its genetics based on E/_ a/a. Entirely black coat, with no dilutions and no Agouti gene action restricting black pigment to the points.
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 Paint Bay. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a To/n, E/e A/a To/To, E/e A/A To/n, E/e A/A To/To, E/E A/a To/n, E/E A/a To/To, E/E A/A To/n, E/E A/A To/To.
As for the dam, being Black, may present in its DNA the alleles: 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).
- a/a (Non-Agouti - Recessive): Allows black pigment to spread uniformly across the body. Essential for Solid Black (if E/).
- To/ (Tobiano): Dominant gene for vertical white patches crossing the back.
Calculated Probabilities
Being the sire Paint Bay with genotype (E/e A/a To/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 Tobiano allele (To).
Being the sire Paint Bay with genotype (E/e A/a To/To), 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 Tobiano allele (To).
Being the sire Paint Bay with genotype (E/e A/A To/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 Tobiano allele (To).
Being the sire Paint Bay with genotype (E/e A/A To/To), 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 Tobiano allele (To).
Being the dam Black 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, allowing black to spread in homozygosis (if Extension is present).
Being the dam Black 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, allowing black to spread in homozygosis (if Extension is present).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint BayOpen Coat ➜ 27,4%
BayOpen Coat ➜ 27,4%
Paint BlackOpen Coat ➜ 13,0%
BlackOpen Coat ➜ 13,0%
Paint ChestnutOpen Coat ➜ 6,6%
ChestnutOpen Coat ➜ 6,6%
Paint Dark BrownOpen Coat ➜ 3,0%
Dark BrownOpen Coat ➜ 3,0%
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