I brought some new chickens to go with my established hens all went well except that they started feather pecking each other and I was ending up with quite a few bald hens tried poultry Stockholm tar and the problem was soon solved I now know who were the bullies and thanks to the tar feathers are now growing back and because the chickens didn't like the taste of the tar they are no longer pecking the new arrivals the only downside is it is very sticky but works brilliantly