I have read that there should be 1 rooster per 10 hens, if you want fertile eggs. Can I keep 4 roos and 40 hens in the same area? There is PLENTY of room. I guess another question is ... does each roo have his own (same) 10 hens all the time, or do the roosters have different hens each day?
These chickens have all been raised together, and they are about 7 weeks old now. I am thinking I will probably end up with 4 - 5 roosters.

These chickens have all been raised together, and they are about 7 weeks old now. I am thinking I will probably end up with 4 - 5 roosters.