Originally Posted by elevatedruby
so use a RIR rooster for sexlinks with BR and SLW? and BR rooster with Red henn would make a brown? Black?barred??
There are a lot longer and more technically accurate versions floating around on the web, but the short of it is:
Barred hen X almost any color rooster (except white or Silver) produces black sex links that can be sexed easily at hatch
Silver hen X red/gold rooster produces red sex links that can be sexed young but not ALWAYS at hatch. (In theory cocks who are another color besides red/gold can work for a RSL but it's not always accurate and it can be hard to get a chick down that is easily and effectively sexable; the hen's color will also sometimes affect the sexability).
The typical crosses used to make commercial Black Sex Links and Red Sex Links are RIRxBR and RIRxDelaware, respectively.
So yes, RIRxBR will give sex links that can sexed at hatch, and RIRxSLW will give sex links that MAY be able to be sexed at hatch but will definitely be able to be sexed within the first couple weeks - younger than most breeds.
BR cock X RIR hen would give 100% single barred offspring with red leakage (a sort of pastel/faint pseudo-Crele coloration), not sexable at hatch.
Actually BR cock X most things will give single Barred offspring with color leakage. Barring is a dominant gene on a black base (black also being very dominant) so it tends to take over other colors very easily.