...
 
I have only JUST begun trying to do this with chickens ... only set my first ever eggs for this purpose this past week ... starting at point A ... or A- ... or A----- ... or further back than that. I knew zippidydoodah about having chickens a couple springs ago ... and even the old-timers here on this farm are perplexed by the idea of a dual-purpose flock on pasture getting to act like chickens ... we don't even have real pasture. Yet.
 
The pasture here gets renewed constantly. It's just large pens/paddocks that  have small breeding flocks rotating between them. Once they wipe one out, they get moved to the next mature succulent greenery. And then comes winter.
 
I think there have been some huge shifts in the whole chicken thing, and it will take a while before we get all our collective "ducks in a row" again now that we've decided to bring chickens home to our back yards and barn yards so to speak. And in reality we'll probably be inventing something new rather than recapturing the past.
 
probably both
 
It used to be that barnyard chickens didn't always need a lot of feed because their job was to clean up everything everyone else around them wasted, and patrol for bugs and other small forms of life and keep things stirred up so they didn't get rank. Now ... most of our Back Yards and our Barn Yards are pretty well dead environments. 
 
And our commercial poultry rations are formulated to keep a specialized factory bird alive for a matter of weeks (meaties) or months (layers) maximum. IMO, the feed needs some tweaking. Pastures? Fresher feeds? Animal products? More living soils?
 
X2
 
And a lot of people can't have roosters or more than 3 birds, so are stuck buying chicks from hatcheries, and raising them by hand, and then they are pretty well pets instead of livestock, so we want them to stay healthy and productive for years instead of months. And of course back in the day people had roosters and hatched their own chicks and a broody bird was a blessing not a curse. 
 
The living conditions need tweaking compared to previous ideas ... can't have chickens ruining the neighborhood, etc.
 
I work with a lot of small cities around here, educating city councils about backyard chickens. It amazes me that they vote on ordinances (that city attorneys copy from other city's ordinances that aren't in the best interest of chickens) and they've never seen a chicken or a BYC coop. I've actually been successful to get council members to visit local coops before they decide to vote on new ordinances. It's like pulling teeth in most cases.
I
 lived in Costa Rica for a while working with Macaws and even in the burbs of the capitol, most people had chickens. I never needed an alarm clock to get to work on time and I grew to love waking to the sound of roosters rather than an alarm. It's just too bad I can't hear my roosters when I'm inside the house. Maybe a good thing for the neighbors.
 
The birds themselves need tweaking because basically all hatchery birds are now leghorns in disguise bred to artificially produce as many healthy offspring at the factory as possible ... alternatively, many of those "heritage breeds" from "real breeders" have been ... lost ... by being turned into show birds.
 
X2 - again.
 
It is going to be work, and it will very likely be highly individualized work. Particularly for those of us just starting out. 
 
I'll have to re-find and re-post the article I once posted about a poultry operation working towards a localized bird ... it was interesting, though I didn't agree with everything about it, and it was for layers instead of dual-purpose birds. Salatin is starting something similar this year with his layers. 
 
Every time I try to make this post shorter, it just gets longer.