I have 8 young hens that will be 14 weeks old tomorrow. Are they old enough for me to take them out of their chicken tractor and combined them with the 1-2yr old birds? They are getting too big for the chicken tractor. I have a back yard that is roughly .5 of an acre and has a large coop with 10 nest boxes. Total I will have 16 back there by Im worried the older ones might kill the younger ones or bother them the whole time. What should I do?