people also used the river where they disposed of their waste as their drinking water source for thousands of years. Older is not necessarily better.It couldn't be too unsafe because that is the way poultry was marketed for hundreds of years. If you check, I think you will find game birds were hung in a dry cool place for several days and they weren't drawn either. Do you remember that Norman Rockwell picture of the old lady at the butcher shop buying a chicken? The one where the butcher has his thumb on the scale pushing down and the old lady has her finger under the scale pushing up? Look at the chicken on the scale. It is defeathered but it has its head and feet and it obviously had not been drawn either. You may be too young to remember that but your grandparents probably can.
What it was was risk management - by keeping the bird intact, there were fewer opportunities for pathogens to enter (the water, as you may recall, often wasn't particularly clean) and chicken was such a luxury (any meat really), it was highly unlikely it would be around long enough to spoil as the innards begin to decompose with time.
Now we (largely) have clean water and modern refrigeration, making it possible to leave a bird in the chill chest until, in spite of refrigeration, it begins to break down beyond the terderization that occurs during wet aging as enzymes begin breakign down some of the tougher connective tissues and rigor passes.
Differing initial conditions, differing solutions. Its a system, everything works together.
/edit and I like three days in the chill chest for my birds (generally aged, 4-5 months or 1 year+ to age), I frequently wet age in buttermilk or live yogurt (enzymes in both help, while also conveying flavor from whatever spices I add), and for ease of processing, I'll do a day in the chill chest for rigor to pass if I'm making sausage with the oldest birds (well, most of a day, since cullings tend to occur mid day, and saussage making gets an early start).
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