thanks for link it was helpful. It looks like i need a white roo to breed with the australorp to get a sex link from her. I dont know what the neighbors will say about another rooster. But a white rock would give me a more options if i want sexlinks with the hens that i have now.MAdchicken... you have to have a barred hen to make sexlinks withe black/red cross anyway... the barring is then passed to only the roos.. they get the white spot on the head and the hens are all black so your RIR/Dominique cross should yield sexlinks, but the RIR/Australorp will not... there is a really good thread on sexlinks here on BYC that explains it really well, fascinating stuff!! Now for red sexlinks, you have to have a Red roo over a predominantly silver hen.. RIR over Delaware for example, maybe even your RIR over Cotton.. haha.. not sure about that one if the colors don't breed true but anyway.. I should have that sexlink thread marked... let me see if I can find it and post the link... I know I have seen people say they have blue sexlinks, and that is when you put a blue roo over a barred hen... so the roos will have the white spot and the hens will be all black or all blue...
Here's the link...https://www.backyardchickens.com/t/261208/sex-linked-information
I also brought Apricot in to see if we can get some chicks to hatch and not freeze. They are due friday. I brought her in on monday. She is getting used to us but still complains a little. She is in my brooder pen.