Sorry to tell you this but he may or may not be split for Lutino. Unless you know one of the parents WAS a Lutino. If his Dad was split for Lutino only half his boys will pick up that split. You won't know for sure 'till you breed him. If he is all it would take is a WF female. Lutino is a sex linked mutation and Fathers pass those genes to Daughters. So if you get any with a common WF female you will know they are females.