I'm in the process of reading a book called "The Omnivore's Dilemma" by Michael Pollan and he wrote about a farmer named Joel Salatin in Virginia who raises chickens,turkey,pigs, rabbits,cattle on a 450 acre farm with 100 acres of pasture. The cattle are all grass fed and he moves them every few days into a new pasture and then moves the chickens in to eat the grubs in the cow pies. The chickens spread the cow manure around ,add their own and basically fertilize the pastures and keep the cycle going.
It's a great book. He also wrote "In Defense of Food". Both of these books would be interesting to anyone who is growing their own food and trying to get away from the grocery store.
glenda