My birds are a cross between BCM roosters, and red-sexlink hens. As such, there has been an explosion of color, comb size, leg feathering, etc... I have been moving birds at 12 weeks based almost entirely on comb size. Small comb, pullet. Well, now at 22 weeks I have a number of birds with enormous combs. They don't have huge tail feathers like their fathers, but the tails are generally erect...its really the huge comb size that has me questioning my choices. I am fairly new to chicks, but is there something I can look for in the vent at this age (22 weeks) that will confirm them as male or female? Nobody but my roosters crow, so I can't use that. I've tried to look at them lifting their head when something happens, but I see that in small combed birds as well as the large combed ones. I would have thought the cockerels would have been attacked, or at least chased, by the Roosters, but there seems to be no concern by the Roosters. FWIW, the 3 BCM Roosters I have (1 is nearly 2, the others are still only 25 weeks) do have issues with each other... Suggestions please?