Everyone talks about keeping new birds away from the existing flock but nobody says how far away. I will be integrating two flocks this spring. I am moving to Ca. and combining my flock with my brothers. Neither flock have any illnesses. How far away from the home flock should the new flock be housed? The home flock free ranges on about an acre. There is an old sheep pen that I can put the new flock in during the quarantine period. It is about 50 feet from the coop. The home flock range on the other side of the coop on the grass, but have access to the area around the sheep pen. Is the quarantine issue one of not introducing unknown birds to yours or is it a case of chickens having different immunities because they are raised in different areas?