Sire Gray Perlino on dam Dun Smoky Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Perlino and a mare Dun Smoky Black. 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 Gray Perlino. Genetically, it presents the base genotype E/_ A/_ Cr/Cr G/n. The (G) gene acts on the base coat promoting progressive lightening throughout the horse's life until reaching very pale or completely white tones. This coat is based on Perlino.
On the other side, the mare Dun Smoky Black contributes with its genetics based on E/_ a/a Cr/n 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 Black.
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 Gray Perlino. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/E A/A Cr/Cr G/n, E/E A/A Cr/Cr G/G, E/E A/a Cr/Cr G/n, E/E A/a Cr/Cr G/G, E/e A/A Cr/Cr G/n, E/e A/A Cr/Cr G/G, E/e A/a Cr/Cr G/n, E/e A/a Cr/Cr G/G.
As for the dam, being Dun Smoky Black, may present in its DNA the alleles: E/e a/a Cr/n D/n, E/e a/a Cr/n D/D, E/E a/a Cr/n D/n, E/E a/a Cr/n 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).
- 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.
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Gray Perlino with genotype (E/E A/A Cr/Cr G/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 Grey allele (G).
Being the sire Gray Perlino with genotype (E/E A/A Cr/Cr G/G), 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 Grey allele (G).
Being the sire Gray Perlino with genotype (E/E A/a Cr/Cr G/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 Grey allele (G).
Being the sire Gray Perlino with genotype (E/E A/a Cr/Cr G/G), 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 Grey allele (G).
Being the dam Dun Smoky Black with genotype (E/e a/a Cr/n 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 has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the dam Dun Smoky Black with genotype (E/e a/a Cr/n 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 has a 50% chance of transmitting the Cream dilution allele (Cr) and always transmits the primitive Dun allele (D).
Being the dam Dun Smoky Black with genotype (E/E a/a Cr/n 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 has a 50% chance of transmitting the Cream dilution allele (Cr) and has a 50% chance of transmitting the primitive Dun allele (D).
Being the dam Dun Smoky Black with genotype (E/E a/a Cr/n 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 has a 50% chance of transmitting 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:
Gray Dun PerlinoOpen Coat ➜ 7,6%
Dun PerlinoOpen Coat ➜ 7,6%
Gray PerlinoOpen Coat ➜ 7,6%
PerlinoOpen Coat ➜ 7,6%
Gray Dun BuckskinOpen Coat ➜ 7,6%
Dun BuckskinOpen Coat ➜ 7,6%
Gray BuckskinOpen Coat ➜ 7,6%
BuckskinOpen Coat ➜ 7,6%
Gray Dun Smoky CreamOpen Coat ➜ 3,3%
Dun Smoky CreamOpen Coat ➜ 3,3%
Gray Smoky CreamOpen Coat ➜ 3,3%
Smoky CreamOpen Coat ➜ 3,3%
Gray Dun Smoky BlackOpen Coat ➜ 3,3%
Dun Smoky BlackOpen Coat ➜ 3,3%
Gray Smoky BlackOpen Coat ➜ 3,3%
Smoky BlackOpen Coat ➜ 3,3%
Gray Dun CremelloOpen Coat ➜ 1,6%
Dun CremelloOpen Coat ➜ 1,6%
Gray CremelloOpen Coat ➜ 1,6%
CremelloOpen Coat ➜ 1,6%
Gray Dun PalominoOpen Coat ➜ 1,6%
Dun PalominoOpen Coat ➜ 1,6%
Gray PalominoOpen Coat ➜ 1,6%
PalominoOpen Coat ➜ 1,6%
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