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Friesian dwarfism

Summary

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.

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.

Gene or region and technical reference

Gene: B4GALT7 (causative). Reference: Leegwater et al. (2016)

Reported alleles

n. Test developed using manufactured DNA, animal controls.

DWF. Test developed using manufactured DNA, animal cases.

Panels: groups of tests that are often ordered together

This test is in the Friesian health & colour panel.

Order tests

There is a one-off sample processing fee of $40 per animal plus the cost of your tests.

How many animals are you testing? Discount or society code:


Pedigree

$33 DNA profile ... more


Panels


Colour panels

$40 Dilutions panel ... more

$120 Full colour panel ... more

$70 Patterns panel ... more


Panels by breed

$115 Arabian health & colour ... more

$50 Arabian health panel ... more

$40 Friesian health & colour ... more

$120 Gypsy health & colour ... more

$50 Miniature ACAN panel ... more

$250 Miniature health & colour ... more

$160 QH health & colour ... more

$90 QH health panel ... more


Good moves


Gaited horses

$9 Lateral gait marker ... more


Good looks


Coat colour

$9 Agouti (bay factor) (agouti) ... more

$9 Red/black ... more


Coat pattern

$9 Frame overo/lethal white syndrome (OLWS) ... more

$9 Grey/melanoma ... more

$9 Lp/Appaloosa/night blindness (CSNB) ... more

$9 PATN1 coat pattern modifier (PATN1) ... more

$9 Roan marker ... more

$9 Sabino 1 ... more

$9 Splashed white 1/deafness (SW1) ... more

$9 Splashed white 2/deafness (SW2) ... more

$9 Splashed white 3/deafness (SW3) ... more

$9 Tobiano ... more

$9 W13 dominant white (W13) ... more

$9 W20 white markings (W20) ... more

$9 W22 dominant white (W22) ... more

$9 W25 dominant white (W25) ... more

$9 W26 dominant white (W26) ... more

$9 W27 dominant white (W27) ... more


Good health


Paint horses

$9 Splashed white 3/deafness (SW3) ... more


Good looks


Colour dilution

$9 Champagne ... more

$9 Cream ... more

$9 Dun and d1 (nd1) (dun/d1) ... more

$9 Pearl ... more

$9 Taffy/silver/eye abnormalities (MCOA/silver) ... more


Good health


Multiple breeds

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

$14 Fragile foal syndrome (FFS) ... more

$9 Frame overo/lethal white syndrome (OLWS) ... more

$9 Grey/melanoma ... more

$9 Lp/Appaloosa/night blindness (CSNB) ... more

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

$9 Splashed white 1/deafness (SW1) ... more

$9 Taffy/silver/eye abnormalities (MCOA/silver) ... more


Pure- and part-bred Akhal-Tekes

$14 Naked foal syndrome (NFS) ... more


Pure- and part-bred Arabians

$14 Cerebellar abiotrophy (CA) ... more

$14 Lavender foal syndrome (LFS) ... more

$14 Occipitoatlantoaxial malformation (OAAM) ... more

$14 Severe combined immune deficiency (SCID) ... more


Pure- and part-bred Connemaras

$14 Hoof wall separation disease (HWSD) ... more


Pure- and part-bred Friesians

$14 Friesian dwarfism

$14 Hydrocephalus ... more


Pure- and part-bred Miniature horses

$14 D1 form of Miniature dwarfism (D1) ... more

$14 D2 form of Miniature dwarfism (D2) ... more

$14 D3 form of Miniature dwarfism (D3) ... more

$14 D4 form of Miniature dwarfism (D4) ... more

$140 Skeletal atavism (SA) ... more


Pure- and part-bred Quarter Horses and Paints

$14 Glycogen branching enzyme deficiency (GBED) ... more

$14 Hereditary equine regional dermal asthenia (HERDA) ... more

$14 Hyperkalaemic periodic paralysis (HYPP) ... more

$14 Immune mediated myositis (IMM) ... more

$14 Malignant hyperthermia (MH) ... more

$9 Splashed white 2/deafness (SW2) ... more


Pure- and part-bred Saddlebreds

$14 Junctional epidermolysis bullosa (JEB2) ... more

Tests can be in the list more than once when the gene in question has more than one effect. It is OK to select the same test once or more than once, the price is the same.