I think that you should expend the experiment to Ducks too.Thank you, Benny! That's a wonderful idea! At least someone here has good ideas!
I actually do have some chickens that haven't had anything but oats for the past few months, so I will try it with their eggs.
The other eggs we've been using are duck eggs that have been laid by ducks who are eating proper food.
I'm definitely going to try that, but first we have to wait until their rash gets all the way better or we won't know for sure.
4 flocks:
Chicken-normal feed
Chicken-only oats
Duck-normal feed
Duck-only oats
And then see the reaction to the eggs.