I am new to chickens and started caring for my friends 9 chickens. 8 of them are Bantams and one is a Barred Rock chicken, which is about twice the size of the rest. The Barred Rock is picking on the youngest and smallest Bantam hen. She chases her away from the food when i first feed them, but allows the her to eat later with thee others. i really cant't figure it out. Any insights would be helpful