Thank you, that is helpful.I'll have to do some searching, and yet may not come up with anything. I take my advice from a section regarding oxidation of feed in the book written by Harvey Ussery. He quotes a poultry feed nutritionist regarding the 6 week issue. I find myself having increasing difficulty accessing fresh feed, even from my favored feed store. I am depending on the fact that my feed is kept super cold right now, which would act to help prevent oxidation of the nutrients.
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https://www.amazon.com/Small-Scale-Poultry-Flock-All-Natural-Approach/dp/1603582908
Before asking, I did find myself wondering what impact storage conditions had on this effect. I guess part of the reason I was looking for detailed studies. So maybe I will also take in to consideration which feed store seems to have the better storage conditions.
I wonder if it's a seasonal thing having farther past mill dates..