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I'm with darkmatter on this one! I hardly ever see a single roach in my coop, and when one appears the chickens snap it up so fast it doesn't know what hit it! And just for the record, I live in Hawaii, so I grew up with roaches too: roaches in the house, roaches in the compost--it's a fact of life in the tropics.
I say congratulations to you, if you've been able to grow so much free protein feed for your birds.
I've been building up deep bedding for months now, putting rotten logs in the coop and flipping them periodically, all TRYING to breed things like roaches and potato bugs and stuff for the chickens so they can get some free natural protein to eat. Chickens are naturally insectivorous! I'm sure chickens CAN get diseases from roaches--it doesn't mean they WILL. Humans CAN get E. coli from eating spinach, but that doesn't mean I'm never going to eat spinach again. Our flocks have eaten all kinds of stuff for twenty years. Frankly, I'd be more concerned about the hazards (to the birds, to yourself, to other organisms in the area) of using pesticides to kill the roaches than I would be about diseases from the roaches.
But if you really can't stomach them anymore, or get the chickens to eat them, it sounds like there are plenty of natural alternatives out there too. Good luck!