• 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

Tobiano

Tobiano is a white spotting pattern consisting of large patches of white that typically cross over the horses topline

Symbol

To

Breeds known to carry this mutation

Many

Inheritance pattern

Autosomal dominant

Description

Tobiano is a white spotting pattern. The large white patches usually have clean edges and often extend across the spine. The legs will often be white and partial or entire blue eyes may be observed. The head is often not affected by To, although it can still carry white markings caused by other genetic markers.

Interpretation of results

n/n: Horse does not carry the To mutation.

To/n: Horse carries one copy of the To mutation and likely has clean edged white patches on its body and extending over its topline.

To/To: Horse carries two copies of the To mutation and likely has clean edged white patches on its body and extending over its topline. It will pass To on to all of its offspring.

Reference

Brooks et al. A chromosome inversion near the KIT gene and the Tobiano spotting pattern in horses. Cytogenetic and Genome Research 2007; 119:225-230. doi: 10.1159/000112065

Powered by © 2022 Racing Australia Limited (ACN 105 994 330)