Yes they will mate and breed. and you do not get a mutt as some uninformed knot-head has posted. The only difference is that you will not be able to auto-sex the baby chicks when they hatch. You will have to sex your chicks another way. Auto-sexing is when you can sex the chicks as soon as they hatch (by color of feathers, a spot on the head, or color of legs, etc). This trait can only be done on the first generation of Cinnamon Queens, It is therefore referred to as not true breeding, meaning the second generation will still be cinnamon queens, but not auto sexing (meaning you cannot tell the sex of the chicks when they hatch; by color of feathers, legs etc.) First generation Cinnamon Queens can be auto-sexed at hatching in the following manner, Cockerels are white, the reddish chicks are pullets.