Dominant White | Equine Testing | Animal Genetics


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Equine Performance Testing
Animal Genetics will soon be offering an equine performance panel. We hope to have more information available soon.

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March 5th-8th, 2015
Animal Genetics Inc. has been invited to attend Crufts dog show from 5th-8th of March 2015 in Birmingham England. Processing of samples submitted during this time may be delayed a few days. Please accept our apologies as we will be back on schedule as soon as we can.

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September, 2014
New test available for dogs. Please see Collie Eye Anomaly (CEA)

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March, 2014
Animal Genetics purchases an additional genetic analyzer (ABI3130xl) to handle increased demand and improve service.

Dominant White (W3, W5 and W10)


White coat color or de-pigmentation phenotype in horses is inherited as a monogenic autosomal dominant trait showing a variable expression of coat depigmentation.

Allele Breed Origination
W1 Franches Montagnes Cigale, 1957
W2 Thoroughbred KY Colonel, 1946
W3 Arabian R Khasper, 1996
W4 Camarillo White Horse Sultan, 1912
W5 Thoroughbred Puchilingui, 1984
W6 Thoroughbred not published
W7 Thoroughbred not published
W8 Icelandic not published
W9 Holstein Horse not published
W10 Quarter Horse GQ Santana, 2000
W11 South German Draft Horse not published

Dominant White is a dominant physical trait, so if a horse has one or two copies of the Dominant White gene, the horse will display the pattern associated with the gene mutation. Testing can determine if the coat pattern of a horse is actually Dominant White (W3, W5 or W10) or if a different modifier is present. This can be particularly useful in horses that have additional patterns, such as Frame Overo and Tobiano. DNA testing for Dominant White (W3, W5 or W10), also identifies if a horse has 1 or 2 copies of the gene, which can be an informative tool for breeders.

If you believe your horse is included in one of these 11 families identified as carrying a Dominant White allele and you would like to confirm if it carries the specific KIT mutation, Animal Genetics has developed genetic tests for many of these alleles and can verify whether or not the horse carries the suspected allele. Please call our office or email us for more information.

Test Results:

Animal Genetics offers DNA testing for Dominant White (W3, W5 or W10). The genetic test verifies the presence of the W3, W5 or W10 mutation and presents results as one of the following:

W#/W# Affected Not believed to be possible but would indicate that the horse carries two copies of the specific Dominant White KIT mutation that was tested.
n/W# Carrier Horse carries one copy of the specific Dominant White KIT mutation that was tested for. Horse will usually exhibit a coat pattern phenotype associated with the particular mutation which could vary greatly from a completely white coat to small areas of white, depending on which mutation is involved.
n/n Negative This horse does not carry the specific Dominant White gene mutation that was tested.

    Submit a Sample for Testing:

    To submit a sample for testing please click on ORDER and download a sample submission form. Then follow the sample collection and submission instructions.


    Cost per sample is $25.00. Please see our Equine Fee Schedule for all equine testing rates.