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This seems to be known by many of the chicken keepers I know but mention this on BYC and other forums and you get told you're talking nonsense.This is a well known biological process called reversion, or often spoken of as "reverting to wild-type." Given enough generations, your chickens would have continued to have genetic drift back towards a more Red Jungle Fowl type of chicken, simply because you stopped selecting who bred who, and let the chickens decide themselves. This happens in shockingly few generations in feral pigs.
This happens because, as mentioned previously in this thread, much of selective breeding doesn't eliminate wild-type gene sequences, it just selects for inhibitors or modifiers.
PS... LOVE Chicken Run.

What there isn't much research on is the reversibility of the egg laying capacity as in how many generations it would take to return to say under 100 eggs per year from a 250 eggs a year hen, and more importantly, would the lifespan increase as a result of this.
I managed to reduce the egg laying by a number of methods such as letting broody hens sit until their egg laying cycle switched off which could add as much as another six weeks of no egg laying each year.
Also, as time went by and of course as the hens got older egg production for some fell below 100 a year at two years and older.