While no differences in reductions of ornithinemia between albino or pigmented Oatrhg mice were detected following injections of the AAV‐OAT vector, Oatrhg mice with white fur showed earlier impairment of b‐waves on ERG by 7 months of age that was corrected by AAV‐OAT injections. This evidence concerns the gene OAT and ornithine aminotransferase deficiency.