I'm feeding my new pullets organic layer pellets. They were used to completely free ranging, but now I have them in a coop and run. They'll get a bit of garden leftovers, but not a lot. How much feed should I give (per hen) each day? When is the best time to feed? By the way, I will NOT be able to just leave feed out. We had a horrible rat problem a couple of years ago when I tried that method. I need to feed them, then pick up what's left at night. Thanks.