Some bloke (can't remember his name) petitioned McDonalds about the battery hens it was using for its meat production. The theory being that if you move McDonalds, the rest of the industry will follow. He was quite successful, unfortunately after his death, in that the chooks McDonalds buy now have almost twice as much room to stand in (unfortunately it's still very cramped, but better than before) and the egg production is the same with standards.

Oh, and I forgot to mention before - we buy ex-battery hens and keep them as our chooks, and when people ask me about them, I tell them how we have to teach them to walk, to scratch, to be chickens.