Probably not more energy. Way more space though. Order of magnitude, at least. For example, sustainably raised beef winds up needing a bunch of pastureland to

Probably not more energy. Way more space though. Order of magnitude, at least. For example, sustainably raised beef winds up needing a bunch of pastureland to rotate through, so that they don't overgraze any one section of grass. Feedlots cram them in and feed them corn or some other grain crop that's had it's own huge energy input. Poultry needs the same sort of thing, or they will scratch their grass down to mud right quick. Most of the cage-free/free range criteria stop in the 5 sqft/bird range, but they need 10x that to not destroy the ground, if they're not moved every few days. (incidentally, vegetarian feed for chickens is good (hey, it won't contain other chickens), but chickens are _not_ vegetarians. They love bugs. Happiness is a flock of chickens and an ant hill.)