I'm new to chicken keeping. I got 2 roosters at the fair (about 5 months old) I haven't yet given them any grit and plan to in the next day or so. What would tell me they were having any issues from me not having given them any grit since I've had them? I just want to be sure I've not harmed them at all. I have stopped giving them any extra treats until they have their grit. Also, is feeding scratch grain necessary, outside of their ususal feed? Just trying to figure all this out. Thanks!