You dont HAVE TO produce one seeing as a white laced red cornish roo is gold and dominant white. You will get sex-linked but probably lose some laying ablity from a RIW. I used a WLR cornish over Delawares and SLW for sex-links. All the females hatch gold/yellow or orange (Im color blind, ok!!) and the males hatch white. Some males have black specks. I think the specks have something to do with the Delawares barring but IDK. The males make for fine meat birds on free range and the females look pretty much like their daddy and lay a respectable 150+ medium sized tinted eggs a year.