I have four 18 week old pullets; we got them when they were 12 weeks old from a local breeder. She gave me a 50 lb bag of crumbles when I bought the chickens, and I assumed that it was age appropriate food. I wrote down the details on the bag before throwing it out, and just looked at my notes this morning. I realized that I've been feeding layer crumbles to my girls rather than grower. None of them are laying eggs yet, so do I need to switch to grower until they do? I hate to buy a 50 lb bag if they'll only need it for a few weeks, but don't want to hurt their development if there are nutrients they're missing by eating layer food too early. Thanks!