Phenotype: Dun-colored Dexter cattle have coats in shades of dark brown to gold.
Mode of Inheritance: Autosomal recessive
Alleles: B = Undiluted pigmentation, b = Diluted pigmentation (dun dilute)
Breeds appropriate for testing: Dexter, Dexter crosses
Explanation of Results:
- Cattle with B/B genotype will not be dun dilute and cannot transmit this dun dilute variant to their offspring.
- Cattle with B/b genotype will not be dun dilute, but are carriers. They will transmit this dun dilute variant to 50% of their offspring. Matings between two carriers result in a 25% chance of producing a calf with dun dilution (dun or red color depending on the presence of red alleles).
- Cattle with b/b genotype will be dun dilute (produce diluted black pigment in their coats) and may be dun or red depending on the presence of red alleles (MC1R genotype). They will transmit this dun dilute variant to all of their offspring.