my yb,s get out in morning with old birds .i somtimes shout them in about 3 or 4 for a feed .when all birds have had a feed birds can go out or stay in it is up to them.i then add more food to hoppers so as when birds come back in later their is food for them. yb,s and old birds are mixed .most yb,s find their own way to yb secsion on their own or just stay in the loft whare they hatched.i know it is not one of the systems like widowhood or round about it is the kinbebothard system . it works for me