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Prairiechicken,
Intention is to have birds train me in what they need.
I free ranged games for years as well. It did not require concern about nutritional requirments since natural forages are tough to beat. Transition to cockyard / keep and challenge presented in respect to nutrtion was something I did not get as involved in since elders had method all worked out. My rearing system now is approaching that of a cockyard and controlling feed cost without compromising bird health is high on concern list.
I think they are doing as you indicate, picking the proper proportions of different items. If you are correct, then as one type of nutrient becomes harder to get the birds will compensate when possible by eating more of something else to bring nutrient intake back into balance. If that is what they do, the birds may be able to provide a guide as to how to formulate my feed mix as natural forage varies with season. Such would bypass need for comparing different formulation based on longer-term growth monitoring (trial and error). I need this because gamefowl formulation handed down to me by grandfather is based on ingredients that are not always easy to get where I live now and they may not be the most cost effective either, especially since the layer pellet portion I buy but have no control over has become based a lot more on grain than animal byproducts. I do not like the newer formulations made for selectively bred laying hens. My birds do not like to eat well despite possibly having all nutrients they need in proper amounts.
Fish meat will likely be used instead of vegan fare. I have easy access to lots of free bighead and silver carp which can be ground into a paste to make fish cakes that can be stored frozen. If all goes well, when fish makes up larger portion of my provided intake during winter, then birds will be able to increase intake of lower protein / higher energy items to maintain balance. Otherwise protein intake will become higher than what is healthy and burn my birds up.