Quality of forage will vary massively, but there's a limit to what data can be collected.
Here in the Sandhills I'm in an "impoverished, fire-dependent" ecology. The quality of soil is better in my current home than my previous home, but crop farming is not done in this part of the county for...
My flock is kept in a very large coop and run, but do not range free and my best attempts at moving my fence still don't result in keeping fresh vegetation constantly available.