Sire Cremello on dam Dun Perlino
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Cremello and a mare Dun Perlino. 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 Cremello. Genetically, it presents the base genotype e/e Cr/Cr. Very pale cream coat, almost white, with blue eyes, caused by double dilution of the cream gene over the chestnut base.
On the other side, the mare Dun Perlino contributes with its genetics based on E/_ 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 Perlino.
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 Cremello. it carries specific gene combinations. The possible genotypes for the sire include variants such as: e/e A/A Cr/Cr, e/e A/a Cr/Cr, e/e a/a Cr/Cr.
As for the dam, being Dun Perlino, 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, 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.
Calculated Probabilities
Being the sire Cremello with genotype (e/e A/A Cr/Cr), 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).
Being the sire Cremello with genotype (e/e A/a Cr/Cr), 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).
Being the sire Cremello with genotype (e/e a/a Cr/Cr), it transmits the (e) allele to 100% of offspring, allowing only red pigment expression (phaeomelanin) 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).
Being the dam Dun Perlino 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, 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 Perlino 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, 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 Perlino 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 (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 Perlino 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 (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:
Dun PerlinoOpen Coat ➜ 27,5%
PerlinoOpen Coat ➜ 27,5%
Dun CremelloOpen Coat ➜ 18,8%
CremelloOpen Coat ➜ 18,8%
Dun Smoky CreamOpen Coat ➜ 3,8%
Smoky CreamOpen Coat ➜ 3,8%
Want absolute precision?
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