I have several keets, ranging from 4weeks to a day old. Still in brooder for now. Once I move them to the growout pen, how long should they remain penned up before I release them to the flock? I have 9 adult guineas that have free ranged 24/7 for about 8 months now (started with 10, but one disappeared within the first week of release). They roost in a tree in our front yard. The keets were hatched from thier eggs. At what point can I turn them free To join thier flock? Obviously once they are fully feathered and can fly, but is thier a certain age? Thanks!