UC Davis School of Veterinary Medicine Veterinary Genetics Laboratory
Charolais Dilution

The white coat color of the Charolais breed is produced by a mutation in the SILV gene. The effect is dosage related such that one copy of the mutation dilutes red pigment to pale-red and black pigment to gray while two copies produce the typical white phenotype of the Charolais breed.

Allow 2-6 business days for results.

Results reported as:


Two copies of Charolais dilution. Coat color is white.


One copy of Charolais dilution. Coat color is gray or pale-red.


No copies of Charolais dilution.

This test specifically detects the mutation in the SILV gene known to cause the white phenotype of the Charolais breed. Several genes are involved in the production of cattle color and pattern. The results above may not completely describe the color of the animal tested.


Gutierrez-Gil B., P. Wiener, J.L. Williams. Genetic effects on coat colour in cattle: dilution of eumelanin and phaeomelanin pigments in an F2-Backcross Charolais x Holstein population. BMC Genetics 2007. 8:56, doi:10.1186/1471-2156-8-56.

Veterinary Genetics Laboratory, Tel 530-752-2211, Email VGL