Technically, they are all Red Sex Links (Red gene roo x Silver gene hen) but Ideal markets the particular RIR/White Rock combination as Brown Sex Links. Ideal also markets its RIR/Rhode Island White combination as Gold Sex Links and its RIR/Delaware combination as Red Sex Links, but again they are all technically Red Sex Links as the Rhode Island Red rooster carries the red gene and the White Rock, Rhode Island White, or Delaware carries the silver gene. The result of these Red Sex Link crosses is that the chicks can be sexed by color upon hatching (males are white, females are reddish). These same Red Sex Links are sold by other hatcheries under different names such as Red Stars, Gold Stars, Golden Buffs, Cinnamon Queens, Amber Whites, Amber Whites, Bovans Browns, Golden Comets, Isa Browns, Shaver Browns, Babcock Browns, Warrens, Bovans Goldline, etc. The Black Sex Link on the other hand does not use a silver gene hen, instead it is produced by crossing a red gene roo with a barred hen, usually a Barred Rock. The resulting chicks can also be sexed by color at hatching but instead of white males and reddish females as in the Red Sex Links, the Black Sex Link males are black with a white spot on top of their heads and the females are solid black. The temperaments of these various sex links may differ somewhat, depending on which breed of hens is used in the cross, but they are all great layers of large, brown eggs.