Sire Dun Smoky Cream on dam Paint Dark Brown
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Dun Smoky Cream and a mare Paint 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 Dun Smoky Cream. Genetically, it presents the base genotype E/_ a/a Cr/Cr 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 Smoky Cream.
On the other side, the mare Paint Dark Brown contributes with its genetics based on 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 Dark Brown.
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 Smoky Cream. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a Cr/Cr D/n, E/e a/a Cr/Cr D/D, E/E a/a Cr/Cr D/n, E/E a/a Cr/Cr D/D.
As for the dam, being Paint Dark Brown, 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, 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/).
- Cr/Cr (Double Cream): Maximum dilution. Pink skin, blue eyes (e.g. Cremello, Perlino).
- 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 Smoky Cream with genotype (E/e a/a Cr/Cr 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, allowing black to spread in homozygosis (if Extension is present) and always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/e a/a Cr/Cr 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, allowing black to spread in homozygosis (if Extension is present) and always transmits the Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/E a/a Cr/Cr D/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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the sire Dun Smoky Cream with genotype (E/E a/a Cr/Cr D/D), 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 Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the dam Paint Dark Brown 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 dam Paint Dark Brown 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 dam Paint Dark Brown 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 dam Paint Dark Brown 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).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint Dun BuckskinOpen Coat ➜ 14,8%
Dun BuckskinOpen Coat ➜ 14,8%
Paint BuckskinOpen Coat ➜ 14,8%
BuckskinOpen Coat ➜ 14,8%
Paint Dun Smoky BlackOpen Coat ➜ 7,1%
Dun Smoky BlackOpen Coat ➜ 7,1%
Paint Smoky BlackOpen Coat ➜ 7,1%
Smoky BlackOpen Coat ➜ 7,1%
Paint Dun PalominoOpen Coat ➜ 3,1%
Dun PalominoOpen Coat ➜ 3,1%
Paint PalominoOpen Coat ➜ 3,1%
PalominoOpen Coat ➜ 3,1%
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