Protein is only a small part of a complete meal, and no, the spreadsheet isn't limited to just grains and seeds, though it is limited by a lack of good data for AA ratios on some ingredients, and mKE for others.@U_Stormcrow this looks like a very useful spreadsheet! I am feeding my chicken with Cockspur grass and I have tested the gluten and protein levels of it in a lab - 11.13% protein. Same as wheat here.
I am also feeding my chicken with eggs and meaworms, but I think the spreadsheet is only for grains, right?
I recently discovered chickpeas are the same price as wheat here, but have not tested in a lab the protein levels, as there were only two bags in the shop anyway and they didn't expect a new batch soon