Sire Roan Palomino on dam Dun Cremello
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Roan Palomino 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 Roan Palomino. Genetically, it presents the base genotype e/e Cr/n Rn/n. The (Rn) gene acts on the base coat by distributing white hairs throughout the body, giving it a roan appearance. The head and legs retain the original base color tones. This coat is based on Palomino.
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 Roan Palomino. it carries specific gene combinations. The possible genotypes for the sire include variants such as: e/e A/A Cr/n Rn/n, e/e A/A Cr/n Rn/Rn, e/e A/a Cr/n Rn/n, e/e A/a Cr/n Rn/Rn, e/e a/a Cr/n Rn/n, e/e a/a Cr/n Rn/Rn.
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).
- 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/n (Heterozygous Cream): One copy of the dilution allele. Lightens red pigment to gold (e.g. Palomino, Buckskin).
- 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.
- Rn/ (Roan - Rosilho): Mixes white hairs throughout the body, keeping head and extremities in the original color.
Calculated Probabilities
Being the sire Roan Palomino with genotype (e/e A/A Cr/n Rn/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 has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Palomino with genotype (e/e A/A Cr/n Rn/Rn), 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 has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
Being the sire Roan Palomino with genotype (e/e A/a Cr/n Rn/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 has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the Roan allele (Rn).
Being the sire Roan Palomino with genotype (e/e A/a Cr/n Rn/Rn), 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 has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the Roan allele (Rn).
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:
Roan Dun CremelloOpen Coat ➜ 12,5%
Dun CremelloOpen Coat ➜ 12,5%
Roan CremelloOpen Coat ➜ 12,5%
CremelloOpen Coat ➜ 12,5%
Roan Dun PalominoOpen Coat ➜ 12,5%
Dun PalominoOpen Coat ➜ 12,5%
Roan PalominoOpen Coat ➜ 12,5%
PalominoOpen Coat ➜ 12,5%
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