That's my point. A person with a few chickens is buying 50 pound bags of grain at best. The feed company is buying by the trainload and micro nutrients by the ton.
Furthermore, an appropriate balance of amino acids is essential. That requires animal protein or a good understanding of the proper mix of grains and legumes to get all the amino acids that are essential to chickens.
Grains and Legumes won't have micro-nutrients like selenium and copper or vitamins like K, D3, etc.. There may be the possibility of getting a general supplement with those things. Some vitamins are water soluble and some are fat soluble which is another mixing and preservation issue.
Fat and salt levels are important considerations as well.
If one is just mixing grains and seeds, it won't be long before there are nutritional deficiencies unless their chickens have year round access to pristine pasture with lots of bugs and other animal protein sources.
ETA
If one searches hard enough, they can find an organic complete feed at a cost less than they can mix themselves and without the hassle.
I use an organic 16% grower as my base feed for all birds. It's under $22 for a 50 lb. bag. It took me a long time to find it. For chicks and molting birds, I add fishmeal to up the protein. A 10:1 ratio gives me 20% protein.
Furthermore, an appropriate balance of amino acids is essential. That requires animal protein or a good understanding of the proper mix of grains and legumes to get all the amino acids that are essential to chickens.
Grains and Legumes won't have micro-nutrients like selenium and copper or vitamins like K, D3, etc.. There may be the possibility of getting a general supplement with those things. Some vitamins are water soluble and some are fat soluble which is another mixing and preservation issue.
Fat and salt levels are important considerations as well.
If one is just mixing grains and seeds, it won't be long before there are nutritional deficiencies unless their chickens have year round access to pristine pasture with lots of bugs and other animal protein sources.
ETA
If one searches hard enough, they can find an organic complete feed at a cost less than they can mix themselves and without the hassle.
I use an organic 16% grower as my base feed for all birds. It's under $22 for a 50 lb. bag. It took me a long time to find it. For chicks and molting birds, I add fishmeal to up the protein. A 10:1 ratio gives me 20% protein.
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