Wow, it's a good thing I got everything ready for the turkeys yesterday. I expected them to arrive in Steubenville tonight, but they were at the Adena post office this morning. They all made the trip alive, and none of them look sickly. The hatchery put in an extra one for free (which they've done every time I've ordered from them), so I have seventeen poults in the brooder.
I think I've found the solution to my protein source problem, or actually I remembered the solution. Journey to Forever has an article on how to create high-protein feed out of the air (scroll down). I just need to breed some maggots to feed to the turkeys as a supplement. High protein feed plus cutting down the fly population: a win-win situation.