My dominiques started at 10 weeks.
I didn't know they started that young. Since I live in neighborhood, I couldn't risk bothering the neighbors, so I had to find which one it was so I could cull him.
I watched one morning, and as soon as he crowed I snatched him up and put a mark on his comb so I would know who to process first. ( I thought he was just early and I would have time to let the others grow larger before processing them.)
Well, as soon as I got him marked, I heard another crow, but it wasn't from the one I was holding. Then I saw another crow. At that point I knew that I would be having a very large culling session, much earlier than I had expected.
So, as far as dominiques go, they all crow.