Funny how free speech works like that.... People can express whatever ideas they choose whether you like them or not.
That being said, raising mice isn't the worst idea if you need to get a source of protein, but mice eat many of the same things chickens do. They survive mostly on grasses and seed, so you could feed them cheap grain but if you're raising grain why not just feed it to your chickens anyhow? I have kept mice for my snake before and you can just feed 'em chicken scratch. You'd be much better off trapping mice or raising some type of bug. Bugs are a more ideal protein for chickens and often eat things chickens can't. That's the whole point of sustainable meats; taking something that can eat something you can't and feeding it that to get meat. That's how cows and goats and often chickens work. That's why grazers are such a big deal and have been for a long time. It's like... Why raise a crocodile off of chickens so that you can then eat crocodile meat? You could just eat the chicken meat. It's the same thing. If you chickens are eating mice they could just be eating the grains and grass the mice eat instead.
Earthworms are a great way to raise bugs for your animals. They can be raised no-mess indoors. I have a red worm bucket in my garage and there's like 1000 worms in there. I load it down with some used rabbit bedding or chicken poop and leaves and they thrive. I am going to separate them out into multiple buckets soon and they will be able to multiply even more.
I also like rabbits, or guinea pigs, as a source for food. They both reproduce quickly, eat things we can't (grass, clover, etc) and they can also offer food to our chickens and dogs through skulls and skin and bones and feet and such. If you feel the need for a meat source for your chickens that is probably a better way to do it; scraps from butchering, rather than raising out something else entirely.
