Sire Gray Cremello on dam Dark Brown
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Cremello and a mare Dark Brown. 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 Cremello. Genetically, it presents the base genotype e/e 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 Cremello.
On the other side, the mare Dark Brown contributes with its genetics based on E/_ A/_. Dark brown coat, often nearly black, with black points, expressed over the bay base.
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 Cremello. 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.
As for the dam, being Dark Brown, may present in its DNA the alleles: E/e A/a, E/e A/A, E/E A/a, E/E A/A.
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).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
Calculated Probabilities
Being the sire Gray Cremello with genotype (e/e A/A Cr/Cr G/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 Grey allele (G).
Being the sire Gray Cremello with genotype (e/e A/A Cr/Cr G/G), 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 Grey allele (G).
Being the sire Gray Cremello with genotype (e/e A/a Cr/Cr G/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 Grey allele (G).
Being the sire Gray Cremello with genotype (e/e A/a Cr/Cr G/G), 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 Grey allele (G).
Being the dam Dark Brown 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 dam Dark Brown 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 dam Dark Brown 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 dam Dark Brown 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.
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray BuckskinOpen Coat ➜ 28,3%
BuckskinOpen Coat ➜ 28,3%
Gray PalominoOpen Coat ➜ 17,5%
PalominoOpen Coat ➜ 17,5%
Gray Smoky BlackOpen Coat ➜ 4,3%
Smoky BlackOpen Coat ➜ 4,3%
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