Dun coat colours and d1 (dun-style markings without colour dilution)

Why test for dun and d1?

The dun coat colour in horses dilutes both red and black pigment by limiting the distribution of pigment granules to a small part of the hair shaft. This dilution is accompanied by darker undiluted markings that can include a dorsal stripe (most commonly), leg barring, dark ear tips, and shoulder bars. The face and points of dun horses are also usually darker than their bodies.

In contrast, the coat colour and markings associated with d1 reflect what is commonly referred to as counter-shading.These horses are expected to have a dorsal stripe and possibly other markings usually associated with dun. Horses that are positive for d1 but not dun are NOT dun.

Our information and terminology is based on the sequences and content in Imsland et al. (2016): doi:10.1038/ng.3475

Dun

Miniature horse stallion Silver Star King Of Cool shows us his dorsal stripe and mane frosting.

This stallion carries cream and splashed white as well as dun.

Purchase equine DNA testing

Price per horse = sample processing ($40) + tests

Coat colour tests

Base coat colours

$9 Agouti (the bay factor) ...read more
$9 Extension (red/black) ...read more

Coat colour dilutions

$9 Cream ...read more
$9 Dun and d1 ...read more
$9 Silver ...read more
$9 Champagne ...read more
$9 Pearl ...read more

Coat patterns

$9 Grey ...read more
$9 Appaloosa or leopard (CSNB) ...read more
$9 SW1 (Splashed White 1) ...read more
$9 Frame overo (OLWS) ...read more
$9 Tobiano ...read more
$9 Sabino 1 ...read more
$9 W20 white markings ...read more
$9 Roan ...read more
$9 PATN1 ...read more

Inherited disorders

Pure and part-bred Arabian

$14 Cerebellar abiotrophy (CA) ...read more
$14 Severe combined immune deficiency (SCID) ...read more
$14 Lavender foal syndrome (LFS) ...read more

Fell Ponies, Dale Ponies and Gypsy horses

$14 Foal immunodeficiency syndrome (FIS) ...read more

Pure and part-bred Friesian

$19 Friesian dwarfism ...read more
$14 Hydrocephalus (Friesian and other breeds) ...read more

Various breeds

$14 Polysaccharide storage myopathy type 1 (PSSM1) ...read more

Quarter horses and related breeds

$14 Malignant hyperthermia (MH) ...read more
$14 Hyperkalemic periodic paralysis (HYPP) ...read more
$14 Hereditary equine regional dermal asthenia (HERDA) ...read more
$19 Glycogen branching enzyme deficiency (GBED) ...read more

Saddlebred horses and related breeds

$14 Junctional epidermolysis bullosa, Saddlebred form (JEB) ...read more

Parentage/DNA profile

$33 DNA profile (microsatellite) ...read more

Please check with your breed society before
testing for registration; some organise
their own parentage testing.
This order includes:
Samples from offspring and both parents
Samples from offspring and one parent
Offspring sample, parent profile certificates
Offspring sample; parents on file
One sample; no parentage verification

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Need different tests for each horse? You can customise your choices for each horse on next page.