Awe I miss my lamb. Whatever you do, do not use peppermint oil as a fly repellent around them.
I kept sheep and chickens together without a problem for a while. Only problem was with a ram but it wasn't related to the chickens. Ive heard that the birds help keep the parasites down.
I've had ducks and chickens, never had turkeys. Wive brought home 4 poults assuming that since I am on the redneck side that I should automatically know this stuff. One of the poor guys had what looked like a broken or dislocated leg. I've seen that kind of thing happen with chickens and ducks...