Here's a simple formula:
Allow the chickens to free range whenever possible.
Give them cuttings from your garden and table scraps.
Provide them whatever mixed grains and alfalfa you have grown.
In the winter you would have to provide them more feed because there is obviously less to eat on...
I am sure bone meal would provide calcium. I had to look up amaranth and quinoa, because I was not familiar with them. I see that amaranth has calcium. Quinoa probably does also.
I also see that the United Nations General Assembly declared 2013 as the "International Year of Quinoa." So now you...
The average large breed hen eats about 1/4 pound (4 ounces) of feed per day.
You can feed corn to chickens. I was reading that you can harvest field corn and shuck it, and then store the corn on the cob. Then just throw the cobs to the chickens, and the chickens will eat the corn off the cob...