It is time for me to introduce my pullets (16 weeks old) to my older flock. So far I have been feeding the pullets the medicated chick feed. My older hens get 20% layer feed. I have heard that it is not good for young hens that are not laying yet to eat the layer feed because of the calcium in it. Should I stop feeding my laying hens the layer feed and feed all of them a grow feed until the young ones start laying? I think the young ones will start laying in September or October.