Sire Smoky Cream on dam Buckskin
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Smoky Cream and a mare Buckskin. 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 Smoky Cream. Genetically, it presents the base genotype E/_ a/a Cr/Cr. Very pale coat with yellowish highlights, resulting from double dilution of the cream gene over the black base.
On the other side, the mare Buckskin contributes with its genetics based on E/_ A/_ Cr/n. Golden cream coat with black mane, tail and legs, resulting from a single cream gene dilution 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 Smoky Cream. 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.
As for the dam, being Buckskin, may present in its DNA the alleles: E/E A/A Cr/n, E/E A/a Cr/n, E/e A/A Cr/n, E/e A/a Cr/n.
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).
Calculated Probabilities
Being the sire Smoky Cream with genotype (E/e a/a Cr/Cr), 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 always transmits the Cream dilution allele (Cr).
Being the sire Smoky Cream with genotype (E/E a/a Cr/Cr), 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 always transmits the Cream dilution allele (Cr).
Being the dam Buckskin with genotype (E/E A/A Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the dam Buckskin with genotype (E/E A/a Cr/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 has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the dam Buckskin with genotype (E/e A/A Cr/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, restricting black pigment to the extremities and has a 50% chance of transmitting the Cream dilution allele (Cr).
Being the dam Buckskin with genotype (E/e A/a Cr/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 (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).
Based on a standard scenario, the statistical chances for foals from this crossing are:
PerlinoOpen Coat ➜ 30,4%
BuckskinOpen Coat ➜ 30,4%
Smoky CreamOpen Coat ➜ 13,0%
Smoky BlackOpen Coat ➜ 13,0%
CremelloOpen Coat ➜ 6,6%
PalominoOpen Coat ➜ 6,6%
Want absolute precision?
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