• DNA Profiling & 
    Parentage Verification
    We offer DNA profiling which can be used to confirm parentage or the identity of your horse.
    Find out how
  • Genetic Diagnostic Testing
    We offer testing for known mutations that cause genetic disorders. This can be used to prevent the birth of a foal affected by one of these disorders.
    Find out how
  • Coat Colour &
    Pattern Testing
    Our coat colour or pattern testing can be used as an aid for selection to produce a foal of a particular colour.
    Find out how
  • Infectious Disease Testing
    The EGRC is currently executing a trial of PCR detection of the pre-breeding panel pathogens. This service is for veterinarians only.
    Find out how

OAAM

OAAM is a bone defect which causes neurological problems

Full name

Occipitoatlantoaxial malformation

Breeds known to be affected

Arabian and related breeds

Inheritance pattern

Autosomal recessive

Description

OAAM is a developmental defect where the first cervical vertebra is malformed and resembles the base of the skull. The second cervical vertebra resembles the first. This compresses the spinal cord near the base of the skull, causing neurologic effects. Symptoms vary from abnormal head carriage, reluctance to move, neck twisting, progressive incoordination and weakness and inability to stand. Affected horses are usually euthanised.

There appears to be more than one mutation that causes OAAM, and there is a test available for only one of these.

Interpretation of results

n/n: Horse does not carry the mutation associated with OAAM.

n/OAAM: Horse has one copy of the mutation associated with OAAM.

OAAM/OAAM: Horse has two copies of the mutation associated with OAAM.

Reference

Bordbari et al. Deletion of 2.7 kb near HOXD3 in an Arabian horse with occipitoatlantoaxial malformation. Animal Genetics 2017; 48:287-294 doi:10.1111/age.12531

Powered by © 2021 Racing Australia Limited (ACN 105 994 330)

WEBSITE TERMS OF USE | DISCLAIMER | PRIVACY POLICY