What functional attribute did the Irish Setter's ancestral contribution provide to the Redbone Coonhound?

Answer

The breed’s signature deep red or mahogany coat color.

The role of the Irish Setter is specifically mentioned as directly accounting for the breed’s signature hue, as breeders selected for the deep red color for visibility.

What functional attribute did the Irish Setter's ancestral contribution provide to the Redbone Coonhound?
OriginDogbreedhoundRedbone Coonhound