I currently have two flocks of chickens. My first flock is 22 weeks old and is made up of two roosters and two hens. One of my roosters and the hens are RIR's and the other rooster is a Bantam. My RIR rooster is huge and has been mating the hens for about a month now and the girls started laying about two weeks ago. My second flock is 2 months old and is made up of 4 pullets and possibly 1 cockrel. I have been introducing them for about two weeks now by putting the smaller chickens in a pin, in the chicken yard with the older chickens...Just today I have tried putting them all together in the chicken yard for an hour with my supervision...My RIR rooster tried to mate with on of my pullets twice while they were together. Feathers went flying.My question is...At what age is a pullet ready to recieve a rooster? Is this safe for my pullets at 2 months old? Could he hurt them at this age? Should I keep him separate while I'm trying to introduce the older chickens to the younger ones by putting him in the pin? I appreciate any info. in this matter.