I have 12 pullets 10 and 12 wks old. I feed them chick starter feed and give them treats consisting of mostly fresh vegetables, black oiled sunflower seeds, and occassionally oatmeal or yogurt once per day about 5x per week. They have a 10x20 run that is mostly dirt now. It's unlikely that there are very many bugs left. They usually don't eat much grit even though I have it available free choice. I did try putting it in the feed, but stopped because I really didn't know how much to put in and felt they'd know better than me what they needed. But the last two weeks they've gone through nearly 10 lbs. of grit. There hasnt' been any change in their diet. I've always thought they would know how much grit to eat, but it seems to me that this is alot of grit for 12 chickens. Why the sudden increase? Should I be concerned?