Thank you, this was very helpful! Mine have an 11x19 run. I let them out to free range for 1-2 hours a day. They also get some scratch grains and black soldier fly larvae each day. It would be great if you didn’t have to buy commercial feed anymore! That’s a great goal!
the "thumb rule" is about 1/4# per bird, per day of a commercial ration for something like a commercial layer. That's NOT applicable to a "meatie" like a CX, and is is traditional commercial (or closely held backyard) chickens. Your ability to free range, depending on size and quality of the pasture, will have a seasonal effect - more when things are in fruit/seed/new growth - much less when dormant or preparing for dormancy. That said, with only an hour or two daily, I doubt you will see much impact, even with a very good pasture.
It is essentially impossible to maintain modern birds in peak condition without use of modern feeds - your casual mention of scratch grains and BSFL is all I need to read to have strong suggestion your are not yet nearly qualified to try to assemble a nutrtitionally complete feed without relying on a commercial supplier, and the conditions offered your birds suggests you likely do not have the resources, either. It takes a LOT of space to deliberately raise what you need to feed chickens solely from your own property, or the chickens have to be part of a balanced ecosystem, relying on waste/scrap/spillage from numerous other activities and animals. As there is no mention of cows, pigs, horses, goats, acres of plantings, etc... The old time methods assumptions are quite likely inapplicable to your circumstances (and don't support a modern bird in peak condition, anyways).
Not a dig at you in any way, simply an acknowledgement of reality - there's a lot of things not widely told to people making effort to in some way recreate some idyllic past. Welcome to BYC.
and for what its worth, my flock is in my Sig, below. Seasonally, my
biodiverse polyculture saves me 15-35% on feed costs monthly (which are significant), and
I am deliberate in my efforts to produce a bird well suited to free range my area. They have 24/7/365 access to the pasture and surrounding wood.
Finally, I am NOT a Vetrinarian, a trained Animal Feed specialist, involved in a collegiate-level agriculture program, or the like. Neither have I been doing this very long. I am, however, actually "doing it", and publicly posting my successes and failures along the way, with careful effort to identify conditions which make certain techniques and management methods successful (or not) which may - or may not - be applicable to others. ...and I'm developing some measure of respect around BYC on the subject of feeding chickens. I've done a LOT of reading, and learned from many others here of similar background.
Likely you will see my name a lot in the BYC feed forums. Shadrach's comments on the first page are very good, though some may read them and overestimate what can be obtained from "good pasture". This sentence "I mean at least a couple of acres of mixed grasses and woodlands that the chickens can access from dawn to dusk." by
@Shadrach is not a caveat, its a minimum necessary requirement. A baseline from which supporting management methods can be developed. THEN one must be very specific in their plantings to manufacture that "good pasture".
FWIW, I feed between 11 and 14# daily for 60-70 birds, including roughly 10 ducks, seasonally dependent. The goats are fed seperately, and while their is some opportunism by both, it sort of balances out. Mostly.