Omega-6 only changes in ruminants (but ruminants don't tend to have a lot of omega-6 no matter what), not poultry, so omega-6 will be the same. There will be less omega-3, but I don't really think that we should be looking to duck fat for our omega-3. it's a non-issue. Less corn will mean more CLA and TVA.
I think the main reason to try to get as much non-corn in as possible is the quality of the eggs. Huge difference.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!