Also, several registries don't recognize brown as a color. It's relatively recent that they've been able to distinguish between bay and brown genetically, so many registries just haven't caught up with the times. Not sure about Standardbred Canada.
I would guess that most Weatherby registered "bay" thoroughbreds probably aren't bay but brown according to colour analysis on this site - but I don't actually think it matters. If people wish to call a horse with a brown body and black legs and mane and tail "bay" then it is "bay" as far as recognising everyday colours go and in common usage if not genetically.
You are never going to stop the Irish calling their connemaras "duns" even though they don't carry the dun gene.
My TB mare is registered dark brown/bay..lol. She's a brown, but I call her bay just because I don't want to argue with people. She has all the bay points, just the slightly lighter muzzle in the winter, no soft points aside from there though. Posted via Mobile Device