Ever since a incident involving PetSmart selling me a very small bag of hay for a outrageous price and telling me to only feed a very tiny bit to my Guinea Pigs, which is completely inappropriate, as they need 24/7 access to hay, I've been doing my own research before feeding a pet. So I just want to make sure what I'm planning on doing is ok . I'm getting 9 hens and a rooster and I want them all to be fed everything they need, including fresh grass, fresh berries, scratch, feed, ect. Now I'm worried that the rooster won't do too well on laying feed, and that the laying feed wont make good eggs. So from what I've heard, I'm thinking about using unmedicated Start & Grow and then feeding oyster shell to the hens only (The rooster shouldn't need it. Right?) for better egg shells. Will this work? I don't know if chick food like this is ok for laying hens. Also, just to ask, is the Purina Oyster Shell supplement a waste of money? Should I buy it somewhere else? It's about $4 where I live to buy a bag of it roughly equivalent to the size of a 5lb bag of feed, with the exception it weighs a lot less.