• 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

Red Factor

This gene determines whether the horse will have any black pigment in its coat

Alternate names

Extension, Red/Black

Symbol

E/e

Breeds known to carry this mutation

Most

Inheritance pattern

Red pigment (e) is recessive to black pigment (E)

Description

Inheritance of the base colours of chestnut, bay and black is dependent on two genes. The first is MC1R which will determine whether black pigment is expressed. The dominant allele (variant) is indicated with a capital E and allows black pigment on the coat. The recessive allele (e/e) prevents black pigment, so the horse is chestnut. When mated, two chestnuts can only ever produce chestnut foals.

Interpretation of results

e/e: Horse is homozygous for the recessive chestnut allele. The horses base colour is chestnut.

E/e: Horse is heterozygous for the recessive chestnut allele. The horses base colour is bay or black.

E/E: Horse has no copies of the recessive chestnut allele. The horses base colour is bay or black.

Reference

Marklund et al. A missense mutation in the gene for melanocyte-stimulating hormone receptor (MC1R) is associated with the chestnut coat colour in horses. Mammalian Genome 1996; 7: 895-899

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

WEBSITE TERMS OF USE | DISCLAIMER | PRIVACY POLICY