Sire Gray Black on dam Roan Smoky Black
In this article, we will explore the genetic possibilities of coat colors for the crossing between a stallion Gray Black and a mare Roan 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 Black. Genetically, it presents the base genotype E/_ a/a 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 Black.
On the other side, the mare Roan Smoky Black contributes with its genetics based on E/_ a/a Cr/n Rn/n. The (Rn) gene acts on the base coat by distributing white hairs throughout the body, giving it a roan appearance. The head and legs retain the original base color tones. 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 Black. it carries specific gene combinations. The possible genotypes for the sire include variants such as: E/e a/a G/n, E/e a/a G/G, E/E a/a G/n, E/E a/a G/G.
As for the dam, being Roan Smoky Black, may present in its DNA the alleles: E/e a/a Cr/n Rn/n, E/e a/a Cr/n Rn/Rn, E/E a/a Cr/n Rn/n, E/E a/a Cr/n Rn/Rn.
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/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).
- G/ (Grey - Tordilho): Causes progressive greying. It is epistatic (covers other colors).
- Rn/ (Roan - Rosilho): Mixes white hairs throughout the body, keeping head and extremities in the original color.
Calculated Probabilities
Being the sire Gray Black with genotype (E/e a/a G/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 Grey allele (G).
Being the sire Gray Black with genotype (E/e a/a G/G), 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 Grey allele (G).
Being the sire Gray Black with genotype (E/E a/a 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, allowing black to spread in homozygosis (if Extension is present) and has a 50% chance of transmitting the Grey allele (G).
Being the sire Gray Black with genotype (E/E a/a 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, allowing black to spread in homozygosis (if Extension is present) and always transmits the Grey allele (G).
Being the dam Roan Smoky Black with genotype (E/e a/a Cr/n Rn/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 Roan allele (Rn).
Being the dam Roan Smoky Black with genotype (E/e a/a Cr/n Rn/Rn), 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 Roan allele (Rn).
Being the dam Roan Smoky Black with genotype (E/E a/a Cr/n Rn/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 Roan allele (Rn).
Being the dam Roan Smoky Black with genotype (E/E a/a Cr/n Rn/Rn), 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 Roan allele (Rn).
Based on a standard scenario, the statistical chances for foals from this crossing are:
Gray Roan Smoky BlackOpen Coat ➜ 11,0%
Roan Smoky BlackOpen Coat ➜ 11,0%
Gray Smoky BlackOpen Coat ➜ 11,0%
Smoky BlackOpen Coat ➜ 11,0%
Gray Roan BlackOpen Coat ➜ 11,0%
Roan BlackOpen Coat ➜ 11,0%
Gray BlackOpen Coat ➜ 11,0%
BlackOpen Coat ➜ 11,0%
Gray Roan PalominoOpen Coat ➜ 1,5%
Roan PalominoOpen Coat ➜ 1,5%
Gray PalominoOpen Coat ➜ 1,5%
PalominoOpen Coat ➜ 1,5%
Gray Roan ChestnutOpen Coat ➜ 1,5%
Roan ChestnutOpen Coat ➜ 1,5%
Gray ChestnutOpen Coat ➜ 1,5%
ChestnutOpen Coat ➜ 1,5%
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