It depends on the cockerel, with some starting before 8 weeks and some waiting more than 6 months.Do they start trying to mate this early?
Sometimes that's a pecking order thing, but sometimes it's cockerels trying to figure out how to mate-- grabbing the feathers on the back of the hen's head is the first step.I haven't seen any attempts yet, but a few of the cockerels have been pulling feathers on each other's or the pullets heads, usually just when they're going to eat in the morning and I assume it's a pecking order thing..
I don't really have anywhere I can separate them without building another run, so I guess the solution will be butchering sooner rather than later.

Sounds like an excellent way to decide!There's definitely one roo in particular who pecks everyone and just has a mean look all the time. He's not the biggest, but I think he'll be the first to go.