Glycogen branching enzyme deficiency (GBED)

Why test for GBED?

Glycogen branching enzyme deficiency (GBED) is a genetic disorder found in pure and part-bred Quarter Horses and Paint horses. GBED usually causes abortions. Foals that survive until birth show severe weakness, seizures, and low body temperature. GBED is always fatal.

GBED can happen in both male and female foals. Foals with GBED need to have gotten the GBED mutation from both parents, not just one. When a horse is passed the GBED mutation from just one parent it is called a GBED carrier. You cannot tell from performance or appearance that a horse is a GBED carrier - you need to test to find out.

Don't breed two GBED carriers to one another. If you do, you may lose the foal to GBED.

The GBED test is part of the 5-panel and 6-panel. Our test is based on the DNA sequences and information in Ward et al, 2004.

GBED

GBED can be found in:

  • Pure and part-bred Quarter Horses
  • Pure and part-bred Paint Horses

All known cases have occurred in descendents of Zantanon, a QH stallion born in 1917.

Purchase equine DNA testing

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

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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

Warmbloods and related breeds

$14 Fragile foal syndrome (FFS) ...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
$14 Glycogen branching enzyme deficiency (GBED) ...read more

Saddlebred horses and related breeds

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

Pure and part-bred Akhal Teke

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

Pure and part-bred Connemara

$14 Hoof wall separation disease (HWSD) ...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 SW3 (Splashed White 3) ...read more
$9 Frame overo (OLWS) ...read more
$9 Tobiano ...read more
$9 Sabino 1 ...read more
$9 W13 dominant white (Miniatures) ...read more
$9 W20 white markings ...read more
$9 W22 dominant white (TB, Paint) ...read more
$9 W25 dominant white (TB) ...read more
$9 W26 dominant white (TB) ...read more
$9 W27 dominant white (TB, Paint) ...read more
$9 Roan marker ...read more

Parentage/DNA profile

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

Remember: most breed societies ask members to test through their society.

Parentage verification: