One of my cockerels has grown and next month, he is going to turn 1 yr. old. But he still isn't mature and is also afraid of those other hens and his foster sister. I was wondering, what is the problem of that cockerel? On the other hand I have 6 chicks that are very light, weak and their feathers are a sort of very uneven. I have noticed nothing wrong in their droppings. What medicine should I use to treat those 6 chicks?