I have yet to see evidence of botulism in my chickens eating the maggots / pupae. Feeding with maggots has been purposeful for last couple of months but the chickens have gotten on and off access to such eats for far longer.
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Don't use wikipedia as a resource , it's not allowed in college papers due to a lot of inaccuracies.Was just reading up on Avian Botulism at USGS and Wikipedia according to USGS it is primarily a Hawaiian thing. Birds eating fish and filter feeders concentrate the bacterium hosting botulism then die and their maggots then concentrate the toxin and kill birds eating those maggots. So.... really not a thing here in a non aquatic/wetland environment in the lower 48, but it still is something new to me and I am no subject matter expert after reviewing two sources online.
it's your prerogative if you want to chance it, I personally don't take chances with my flock. Your now aware of the risk, and just because it hasn't happened yet doesn't mean it wont. I got hold of some darkling beetles that are in a container where other things can't get in and takes a bit as they only life for about 2 months but lay about 500 eggs each that turn into your meal worms. It isn't that expensive just need to put bedding and scraps from meal prep or vegetables that are to over ripe they love and you know they are clean , they get their water from what you feed them.I have a lot of chickens over a good many years. Experience must count for something.
I have to wonder why you're dispatching enough predators to ask this question. Perhaps look into electric fencing around your coop and run area, if it's feasible, to avoid having ground predators to worry about. Just a thought.