The carrier prevalence of severe combined immunodeficiency, lavender foal syndrome and cerebellar abiotrophy in Arabian horses in South Africa.
Authors: Tarr C J, Thompson P N, Guthrie A J, Harper C K
Journal: Equine veterinary journal
Summary
# Editorial Summary: Genetic Disease Carrier Prevalence in Arabian Horses Severe combined immunodeficiency (SCID), lavender foal syndrome (LFS) and cerebellar abiotrophy (CA) represent significant inherited conditions in Arabian horses, yet their prevalence in regional populations remained poorly quantified. Tarr and colleagues conducted a carrier prevalence survey of Arabian horses in South Africa, examining how widespread these recessive genetic conditions were locally and assessing whether introducing genetic testing had measurably reduced SCID carrier rates over time. The study revealed the actual burden of these three conditions in the South African Arabian population and demonstrated the population-level impact of implementing genetic screening programmes. For breeding practitioners and veterinary professionals, these findings underscore the critical importance of genetic testing before breeding—particularly given that carriers show no clinical signs yet can produce severely affected offspring when paired with other carriers. Understanding regional carrier frequencies allows informed risk management in stud selection and helps breeders make evidence-based decisions to reduce the incidence of these debilitating inherited diseases in their herds.
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Practical Takeaways
- •Breeders of Arabian horses should utilise available genetic tests for SCID, LFS, and CA to identify carriers and make informed breeding decisions
- •Genetic screening can effectively reduce the prevalence of these serious inherited conditions in Arabian populations over time
- •Understanding local carrier prevalence helps breeders assess risk and plan breeding programmes to minimise affected foals
Key Findings
- •Carrier prevalence of SCID, LFS, and CA was quantified in Arabian horses in South Africa to assess local disease burden
- •The study compared SCID carrier prevalence before and after introduction of genetic testing to evaluate the impact of testing on population genetics
- •Genetic testing was shown to be an effective tool for managing carrier prevalence in the Arabian horse population