I have a mixed flock of 2 turkeys ,2 ducks, and 9 chickens. They are all between 14 to 16 weeks old. I currently feed them Nutrena All Flock pellets and they love it. As my hens get closer to egg laying age, do I need to put them on a layer pellet feed ? If so , at what age ? When they molt in the fall do I need to switch to a "feather fixer" feed ? I'm new at this and there are a lot of bags of feed out there. -Thanks