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Article History

Received: 2 August 2025

Accepted: 18 September 2025

First Online: 24 October 2025

Declarations

:

: EE, BJT, and RRB are affiliated with the UC Davis Veterinary Genetics Laboratory, which provides genetic diagnostic testing in horses and other species. No other authors have a conflict of interest.

: Hair and blood samples from the affected foal, dam, and his paternal half-siblings were collected under the ethical review provided by the UC Davis Institutional Animal Care and Use Committee as part of Protocol #22786 and experiments were performed according to what was reviewed. A hair sample from the sire was provided by Weatherbys Scientific on behalf of the Coloured Horse and Pony Society (UK) (CHAPS UK) as part of a previously banked sample for registration. The ocular exam and euthanasia were performed at the request of the owner following standard of care and Royal College of Veterinary Surgeons (RCVS) code of practice. Where applicable the study is reported in accordance with ARRIVE guidelines.

: The owner of the affected case consented to study and to the data being published.