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Genetic Condition Threatens Future of Quarter Horse Breeding

3/31/2025

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Summary

Story summary

In spring 2020, a Quarter Horse foal in Oregon was diagnosed with Equine Juvenile Spinocerebellar Ataxia (EJSCA), a devastating hereditary condition that rapidly damages nerve cell myelin sheaths. Researchers at UC Davis discovered EJSCA in 12 foals, all traced back to one stallion. With no cure available, breeders are strongly encouraged to test for carriers to safeguard future generations.

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Story summary

In spring 2020, a Quarter Horse foal in Oregon was diagnosed with Equine Juvenile Spinocerebellar Ataxia (EJSCA), a devastating hereditary condition that rapidly damages nerve cell myelin sheaths. Researchers at UC Davis discovered EJSCA in 12 foals, all traced back to one stallion. With no cure available, breeders are strongly encouraged to test for carriers to safeguard future generations.