Sire Paint Smoky Cream on dam Dun Cremello
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Paint Smoky Cream and a mare Dun Cremello. 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 Smoky Cream. Genetically, it presents the base genotype E/_ a/a Cr/Cr 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 Smoky Cream.
On the other side, the mare Dun Cremello contributes with its genetics based on e/e 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 Cremello.
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 Smoky Cream. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a Cr/Cr To/n, E/e a/a Cr/Cr To/To, E/E a/a Cr/Cr To/n, E/E a/a Cr/Cr To/To.
As for the dam, being Dun Cremello, may present in its DNA the alleles: 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, e/e a/a Cr/Cr D/n, e/e a/a Cr/Cr D/D.
Understanding the Alleles
To understand the result of this crossing, note the gene sets at play:
- e/e (Red Factor - Homozygous Recessive): Determines the inability to produce black pigment, resulting in an exclusively red base coat (Chestnut).
- 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 Paint Smoky Cream with genotype (E/e a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Tobiano allele (To).
Being the sire Paint Smoky Cream with genotype (E/e a/a Cr/Cr 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 Cream dilution allele (Cr) and always transmits the Tobiano allele (To).
Being the sire Paint Smoky Cream with genotype (E/E a/a Cr/Cr 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 always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the Tobiano allele (To).
Being the sire Paint Smoky Cream with genotype (E/E a/a Cr/Cr 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 Cream dilution allele (Cr) and always transmits the Tobiano allele (To).
Being the dam Dun Cremello with genotype (e/e A/A Cr/Cr D/n), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the dam Dun Cremello with genotype (e/e A/A Cr/Cr D/D), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele to 100% of offspring, restricting black pigment to the extremities and always transmits the Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the dam Dun Cremello with genotype (e/e A/a Cr/Cr D/n), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and always transmits the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the dam Dun Cremello with genotype (e/e A/a Cr/Cr D/D), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) and transmits the (A) allele (restriction) to 50% and the (a) allele (no restriction) to the other 50% and always transmits the Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Paint Dun PerlinoOpen Coat ➜ 9,8%
Dun PerlinoOpen Coat ➜ 9,8%
Paint PerlinoOpen Coat ➜ 9,8%
PerlinoOpen Coat ➜ 9,8%
Paint Dun CremelloOpen Coat ➜ 8,8%
Dun CremelloOpen Coat ➜ 8,8%
Paint CremelloOpen Coat ➜ 8,8%
CremelloOpen Coat ➜ 8,8%
Paint Dun Smoky CreamOpen Coat ➜ 6,5%
Dun Smoky CreamOpen Coat ➜ 6,5%
Paint Smoky CreamOpen Coat ➜ 6,5%
Smoky CreamOpen Coat ➜ 6,5%
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