There are some good threads on here about feed and whether it's worth it to try to grow your own. @U_Stormcrow and @Perris are good sources on that topic.
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-- I probably should have written "they might" or "they could well" instead of the bolded above. Chickens don't turn on and off with a switch, of course. But when you're trying to make a business of this, you want to even out any low-production periods to smooth out your income stream....If you start now with your ideal number of stock, they will nearly all poop out and go non-productive on you at the same time, requiring replacement all at once with the resulting non-productive period as they grow.
No, you hit on a key issue a lot of people are unaware of. Top production breeds have sharp reductions in productivity. A bird that produces 300 eggs in its prime year might produce 220 its second, and only 150 its third - at which point you are feeding two birds for the production of one. [Less productive breeds tend to have lower rates of production reduction - but are less productive overall. So you get more "productive" years out of them with lower average egg count each season. If your replacement costs are high (or your feed is free) that might make economic sense - but usually not]-- I probably should have written "they might" or "they could well" instead of the bolded above. Chickens don't turn on and off with a switch, of course. But when you're trying to make a business of this, you want to even out any low-production periods to smooth out your income stream.