Was checking out when I should switch to a different feed. They (5 weeks old)are on Purinia Medicated chick feed. Bag says layer feed at 18 weeks. My question is do I go straight to layer pellets or do I switch to growth feed at 10 weeks, then to layer pellets? The breeder I got them from said they keep them on the medicated chick feed until they lay their first egg, then switch to layer feed. They are getting a little scratch in the morning (about 1/8th of a cup).