This is so disturbing. A week ago last Thursday, I received 16 one-day old keets. My brooder box has one of those wonderful Brinsea Brooder shelters which the keets go under and provides the exact same warmth as a mama hen would. They have water and two feeders of food. There are wood chips as a base. I have lost 5 of the keets so far. One each morning is dead with horrible pasty butt. Meanwhile, they all are running around looking so healthy and happy and then overnight, another one dies. Does anyone know what causes pasty butt and what I can do to stop this? I once saw it on a baby chick I had and I gently washed her butt until the plug dissolved and she lived and was healthy. This is so distressing to be losing these babies. Thanks!