Brian Kerkvliet of Inspiration Farm in Bellingham Washington shows off an amazing technique of converting funky meat into fresh maggots for chickens.
A bucket on a tripod with some dry hay/grass/straw. There are holes in the bucket to let the flies in and the maggots out. The straw helps to keep the stink down. I couldn't smell anything, but the flies sure seemed to be able to find it.
The maggots go to the bottom of the bucket and the head out the bottom of the bucket to enter into their next stage of devlopement. That's the point where the chickens grab them!