Hi...my small flock has reached 5 months old, and I understand it's time to switch them to layer food. I have a few questions! Pardon my ignorance! First, is the laying food OK for my two roo's to eat? What do I need to supplement their diet with? Besides grit, oyster shell. Last, I know with dogs you have to slowly change their food. Is this necessary with chickens too? Thanks so much!!!