How long should I keep my hens with a certain roo and how do I wait to collect her eggs to be sure he is the father to the offspring? I house all my birds together but when I want to hatch some eggs I want to be sure of the parents, so I can seperate them and put them in a smaller coop. How long do I need to wait to start collecting the eggs and will doing it this way cause problems when re-introducing them back to the flock?