You will probably get some comments from people about how you have too many roosters and will definitely have problems with over-mated hens. Don’t let them worry you too much. I usually recommend you keep the least number of roosters to still meet your goals because the more roosters you have the more likely you are to have a problem, but there are people that don’t have those problems with hen to rooster ratios much worse than yours. There are people that have those problems with only one rooster and over 20 hens. It very much depends on the individual roosters and the hens’ personalities play a part too.
What you will probably see with yours is that they will be very active sexually when they are adolescents. You may have problems until thy mature. It is something to watch for and be aware of, but if you can get through the adolescent phase, you will probably be OK.
As far as fighting to establish the pecking order. They have been establishing the pecking order since they were first put together in the brooder. But they mature at different rates and the pecking order changes as they mature. Usually if they are all the same age, that kind of stuff does not affect the pullets that much, but it can. You are dealing with living animals so anything can happen. But at that age and for the next few weeks, what I see in my flock is the young roosters fighting some among themselves or with mature hens for pecking order status. This pecking order fighting is usually more pecking and running away but sometimes it does involve serious fighting. It is really rare that I see any chicken harmed in this, but it can happen. I think it helps that I give them enough space so they can run away.
Something else you will probably see is the young roosters fighting among themselves for flock dominance. You’ll probably see some of these as they mature if you are around much to watch. Most of the time with mine the young roosters flair their neck feathers, maybe jump at each other a time or two, then one runs away. That’s usually the end of it for a while. As they continue to mature they may revisit who is in charge, but these are usually not too serious. A lot of the time, unless you watch them a lot you don’t even see most of this.
Occasionally you get a rooster that does not accept victory. He’ll keep after the defeated rooster to try to kill him. Some breeds have those tendencies but it really depends on the individual rooster. I’ve never had that problem but there are people on this forum I trust to know what they are looking at say they have.
The size of the rooster is not hugely important. It’s not that unusual for bantams to dominate full sized chickens. Dominance is more about the spirit of the chicken than about size. Don’t go into shock if you see one of your D’Uccles square off with a larger chicken and maybe even win. The hormones that cause them to fight for flock dominance can be pretty strong. Also don’t put blind faith into the personality the roosters are supposed to have. Each is an individual. They don’t all read from the same book.
In summary, what should you do? Not much. Have a plan if one gets hurt and then observe. Have patience as long as none start bleeding or show real signs of being hurt. Chickens have been sorting this kind of stuff out for thousands of years. They usually sort out the pecking order and flock dominance better without human interference. But you are dealing with living animals so anything can happen. There are no guarantees. Good luck!
