I have turkeys about 6 weeks old, ducks that are 5 and 3 weeks old and I have chicks that are 6 weeks and 3 weeks old. At what age is it ok for the chicks to go onto the all flock? Should I wait till they are 18 weeks or start laying? Right now I’m buying 3 different types of feed and that’s fine I’m just not sure if I can switch and I have had people recommend all flock