This may be only partially true. The research I read supporting this argument was performed on birds that were confined and had no other food options. This is a free range flock.
I see where you're going with this thought, but since the vast majority of backyarders have no free ranging, very little range, drought poor range, extremely bio-limited range, experience 4-6 months of winter sterility in their range, and their feed offered the birds likely makes up 95% of the food supply, the advice/caution about Layer fed to non-laying birds, given above is quite reasonable.
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