I have the opposite experience, my roos try to mate with the ducks! I guess it depends on the breed?Our turkeys and chickens live together. We've had a little sparring since the turkeys started mating and ganging up on the chickens so we built them a pen of their own that we can separate them in to if we need. Usually it isn't an issue. We don't keep them with our ducks because the drakes try to mate with the chickens and it can kill them. Don't think that would be a problem with turkey being bigger than them. When we had geese, our turkeys kept them in line with the flock even though the geese were not the nicest creatures.
