Arabian Horse Obsession!: September 2011 - Arabian Genetics Colouring .. Chestnut Rabicano - Arabians also may have some roaning, although it is not the same gene that causes a true roan like in other breeds (classified by dark head and points along with a lighter colored, nearly white body). Rabicano roaning is often partnered with sabino expression in Arabs. Rabicanos usually have a "skunk tail," one that is partially white.