So, to me, near all my birds seem thin. How do I exactly tell my birds are thin or not? Seems like the bone in the middle sticks out on all of them. How much should I feel on their breasts? I just don't know... If I had a 5lbs and smaller scale, like a kitchen scale, I would use that and known weights. But I don't have one, so how else can I know? I feed layer crumbles from Tractor Supply, 2 cups of scratch a day. There are about 30 birds total, most are under 9weeks. They don't free range, but have a 20 by 40ft run. I give them treats 2-4x a week, yogurt, bread, old food, etc.