I keep a colony of dubia roaches to breed so I can feed the nymphs (their young) to my leopard gecko. Every once in a while I need to do a cull, get rid of most or all of the adult males depending on if I need more nymphs for my leo or not, as well as any unhealthy ones
They're one of the healthiest feeder insects out there with a low fat and chitin content compared to high protien and calcium! Extremely easy to care for too.
Depending on where you live they may be illegal though, like Florida, because that is the perfect climate for them to not only survive outside of their enclosure, but also breed, and would likely become invasive quickly. They're fine to keep here in Michigan because they wouldn't survive in our cold, dry (relatively) climate. They wouldn't survive more than a week outside of their enclosure here, even indoors. And escape is rare anyway, since they can't fly or climb. They're designed for life on the tropical forest floor.
If anyone wanted an idea for a healthy chicken treat...