Sire Dun Bay on dam Paint Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Dun Bay and a mare Paint 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 Dun Bay. Genetically, it presents the base genotype E/_ A/_ D/n. The Dun gene acts on the base color, adding the characteristic dark dorsal stripe. In some cases it lightens the body tone and may also produce zebra-like leg markings. This coat is based on Bay.
On the other side, the mare Paint Black contributes with its genetics based on E/_ a/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 Black.
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 Dun Bay. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a D/n, E/e A/a D/D, E/e A/A D/n, E/e A/A D/D, E/E A/a D/n, E/E A/a D/D, E/E A/A D/n, E/E A/A D/D.
As for the dam, being Paint Black, may present in its DNA the alleles: E/e a/a To/n, E/e a/a To/To, E/E a/a To/n, E/E a/a 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).
- a/a (Non-Agouti - Recessive): Allows black pigment to spread uniformly across the body. Essential for Solid Black (if E/).
- D/ (Dun - Primitive Gene): Dilutes body color and adds dorsal stripe and leg barring.
- To/ (Tobiano): Dominant gene for vertical white patches crossing the back.
Calculated Probabilities
Being the sire Dun Bay with genotype (E/e A/a D/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 primitive Dun allele (D).
Being the sire Dun Bay with genotype (E/e A/a D/D), 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 primitive Dun allele (D).
Being the sire Dun Bay with genotype (E/e A/A D/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 primitive Dun allele (D).
Being the sire Dun Bay with genotype (E/e A/A D/D), 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 primitive Dun allele (D).
Being the dam Paint Black 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, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Tobiano allele (To).
Being the dam Paint Black 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, allowing black to spread in homozygosis (if Extension is present) and always transmits the Tobiano allele (To).
Being the dam Paint Black with genotype (E/E a/a 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, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Tobiano allele (To).
Being the dam Paint Black with genotype (E/E a/a 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, allowing black to spread in homozygosis (if Extension is present) and always transmits the Tobiano allele (To).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint Dun BayOpen Coat ➜ 13,7%
Dun BayOpen Coat ➜ 13,7%
Paint BayOpen Coat ➜ 13,7%
BayOpen Coat ➜ 13,7%
Paint Dun BlackOpen Coat ➜ 6,5%
GrulloOpen Coat ➜ 6,5%
Paint BlackOpen Coat ➜ 6,5%
BlackOpen Coat ➜ 6,5%
Paint Dun ChestnutOpen Coat ➜ 3,3%
Dun ChestnutOpen Coat ➜ 3,3%
Paint ChestnutOpen Coat ➜ 3,3%
ChestnutOpen Coat ➜ 3,3%
Paint Dun Dark BrownOpen Coat ➜ 1,5%
Dun Dark BrownOpen Coat ➜ 1,5%
Paint Dark BrownOpen Coat ➜ 1,5%
Dark BrownOpen Coat ➜ 1,5%
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