I have a mixed brood of 4 and 3 week old chicks who go outside regularly in a small run, the rest of the time they are in our utility room. The rest of the ex battery flock and our resident rooster free range around them and don't seem bothered by their presence; would it be ok to put them out with the flock? Would the rooster protect them all as his flock? I thought it might be easier to mix them whilst they are younger rather than waiting until they were mature. Is this ok???