Sire Bay on dam Dun Perlino
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Bay 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 Bay. Genetically, it presents the base genotype E/_ A/_. Brown body with black mane, tail, lower legs and ear tips, due to the presence of black pigment restricted to the points by the Agouti gene.
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 Bay. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e A/a, E/e A/A, E/E A/a, E/E A/A.
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/ (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).
- 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 Bay with genotype (E/e A/a), 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%.
Being the sire Bay with genotype (E/e A/A), 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.
Being the sire Bay with genotype (E/E A/a), 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%.
Being the sire Bay with genotype (E/E A/A), 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.
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 BuckskinOpen Coat ➜ 39,1%
BuckskinOpen Coat ➜ 39,1%
Dun PalominoOpen Coat ➜ 7,0%
PalominoOpen Coat ➜ 7,0%
Dun Smoky BlackOpen Coat ➜ 3,9%
Smoky BlackOpen Coat ➜ 3,9%
Want absolute precision?
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