Friesian dwarfism

Why test for Friesian dwarfism?

The typical features of horses affected by Friesian dwarfism are short legs, ribs that narrow markedly from a broad chest and flexor tendon laxity. Dwarf Friesian horses can be down on their bumpers at maturity, with some reports that it can worsen rather than improve with age.

Our test is for a mutation in the B4GALT7 gene identified in Friesian horses that severely reduces the production of galactosyl transferase I (Leegwater et al., 2016, DOI 10.1186/s12864-016-3186-0).

Friesian dwarfism is an autosomal recessive disorder. Autosomal disorders are equally likely to affect male or female horses, while "recessive" means that a horse needs to inherit the mutation from both its sire and its dam to be affected. Horses that have inherited the Friesian dwarfism mutation from just one parent are called Friesian dwarfism carriers, and do not usually have physical signs of this disorder.

How common is it?

We regularly identify Friesian dwarfism carriers in Australia. However since we are often testing foals from a known carrier parent we are not sure of the true prevalence in our population.

Purchase equine DNA testing

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

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

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 PATN1 ...read more
$9 SW1 (Splashed White 1) ...read more
$9 SW2 (Splashed White 2) ...read more
$9 Frame overo (OLWS) ...read more
$9 Tobiano ...read more
$9 Sabino 1 ...read more
$9 W13 dominant white ...read more
$9 W20 white markings ...read more
$9 Roan marker ...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.