Who has a good grasp on Sexlink Genetics?

[halo]

No, but the other way around should.

 

[deerman]

RIR rooster X BR hen = black chicks all cockerel will have a white spot on their head. you can also use a NH in place of the RIR.

 

[flyingmonkeypoop]

Or you could use a brown leghorn rooster or a buckeye or many other breeds in place of the RIR/NHR. You could even use a blue rock cock on barred rock hens to get the same basic black sexlinks where the males will be barred and the females will be black.