Dun Color in Dexters

Quick Summary

The dun coloration in Dexter cattle is caused by the dilution of black pigment in the hair, producing shades of dark brown to gold. This color dilution is caused by a recessive mutation.

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.
Price

$25 one test per animal

Also available as part of the following packages:

$35 this test + one test from list below
$45 this test + two tests from list below
$55 this test + all tests from list below

Additional Details

The dun coat color in Dexter cattle is a dilution of black pigment (eumelanin) caused by a recessive mutation in the gene tyrosinase related protein 1 (TYRP1), also known as the Brown locus. The hair color is diluted to shades of dark brown to gold. Red pigment is not diluted by this mutation.

This genetic test is specific for the Dexter Dun mutation.

 

Note: An additional test for red/black pigment (MC1R or Extension gene) may be needed to determine the complete coat color genotype and possibilities for offspring color.
Turnaround Time
2-6 business days
Type of Sample

Species

Type of Test

Results Reported As
Test Result Dexter Dun
B/B Animal does not have the Dun mutation.
B/b Animal carries one copy of the Dun mutation. Color is not diluted.
b/b Animal is homozygous for the Dun mutation.
References

Berryere, T.G., Schmutz, S.M., Schimpf, R.J., Cowan, C.M., & Potter, J. (2003). TYRP1 is associated with dun coat colour in Dexter cattle or how now brown cow? Animal Genetics, 34(3), 169-75. doi: 10.1046/j.1365-2052.2003.00985.x