Our four hens (contrary to my username ) are ~9 months old. We recently got them back, and the person taking care of them was feeding them scratch, so we got some, too. So, my question is, how much? I've read you're not supposed to give them too much...is there a set amount per hen? Also, I've read you shouldn't give it to them when it's hot, and it's been high 80s here every day. Any thoughts? Thanks!!