I am confused about the feed. I have 25 pullets and 1 roo that are just over 6 weeks old. The book I have says to give chick starter(18%-20% protein) till 6 weeks, then change to Grower (for Layers 15%-16% protein) till 20 weeks, then Layer (16%-18%protein). It says to use half scratch/half mash to make the Grower feed at 15% protein. What is the Mash?? Is it the Chick starter or the Layer feed?? What do I feed them now? Your help would be greatly appreciated.