x many. I started with an adult flock so I have always had grown-ups to keep the young cockerels in check. It's worked brilliantly and I would hate to have to start over with just chicks.This is exactly so...... It is common because people buy chicks from a hatchery and have pullets and cockerels the same age growing up together without adult birds to keep them in check and teach them how to behave. People assume because they see the same behaviour in their flock that it is "normal" and acceptable behaviour..... it is not. If these birds were raised more naturally, the mature rooster of the flock would run off the young males once they started this behaviour and the pullets and hens would stick close to him for protection. Humankind creates this unnatural environment where there are multiple young males and females in a flock with no adult birds to keep order.
It is an unhealthy situation.
I do hope you are not feeling scolded here, because that is not what is happening. Nor should you feel ashamed. We all started at one time or an other with our FIRST birds! And we have learned as we built and matured our flocks.
RS did an excellent job of telling why such behavior occurs. While knowing why it occurs is helpful in terms of future flock management, that does not solve YOUR problem now.
Many folks doing their first flock set up, start their flock exactly the same way you did: buy hatchery birds from the local feed store. Those chicks are mailed from a hatchery to the feed store, where the customer then buys them. Unfortunately, feed stores can vary from one manager to an other. I've seen well run set ups where the chicks are well tended, and well separated, so there is no chance of them getting mixed up from one bin to an other. Such places are set up so that the customer can view the chicks well, and even choose her chicks, but the customer is not allowed to touch the chicks!
Other feed stores: not so much. Mis-labeled bins. Chicks being handled by customers and even children, then being put back in the wrong bin. Poorly cared for, in filthy bins, pasty butt visible from 10' away, and inadequate heat source. Even dead chicks trampled into the litter.
Plenty of threads on BYC re: TSC improper labeling of their birds: Straight run chicks sold as pullets, meat birds sold as Leghorns, and on it goes. The only advantage of buying from a feed store is that the customer gets to see what he is getting, and the feed store absorbs the cost of the early deaths. However, many feed stores offer no guarantee once a chick has left the store, while direct hatchery shipments offer a 48 hour guarantee.
Sorry for the long book. My fingers sometimes get carried away.
Back to your issue: I would immediately remove all cockerels to a separate coop/run, even if it's just a temporary set up. If you have a favorite cockerel, you could re-introduce him after the pullets start laying. Get rid of the rest. Or even all of them.

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