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The Cream dilution gene is responsible for the palomino, buckskin, smoky black, cremello, perlino and smoky cream coat colors. There are two alleles: CCr and C. CCr is semi-dominant and dilutes red to yellow in single dose (palominos, buckskins, smoky blacks) and to pale cream in double dose (cremellos, perlinos, smoky cream). Cream dilution can have a very subtle effect on black pigment. C is recessive and does not dilute the base color.
Cream Dilution results are reported as:
| N/N | Non-dilute. Basic colors are chestnut, bay, black or brown in the absence of other modifying genes. |
|---|---|
| N/Cr | Heterozygous, dilute, one copy of the Cream CCr allele. Chestnut is diluted to palomino; bay is diluted to buckskin and black is diluted to smoky black. These colors can be further modified by the actions of other genes |
| Cr/Cr | Double dilute (two copies of the CCr allele). Chestnut is diluted to cremello; bay is diluted to perlino and black is diluted to smoky cream. |
Note: The test offered by VGL is specific for a mutation in exon 2 of the MATP gene that is associated with Cream Dilution. Other dilution genes or mutations that may produce coat colors that phenotypically resemble cream will not be detected by the test.