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Growth hormones and steroids have not been legally used in the US poultry industry since the 1950s, they are no the reason for increased poultry growth in the US... The reason today's meat birds are bigger is entirely from selective breeding, better nutrition and an environment tailored towards...

That rapid growth seen in meat birds is a result of the hybrid breed of chicken raised for meat not any 'high speed feed' given... Egg layers need better feed as laying the eggs takes a lot out of the bird, both in energy and nutrients... As said years ago in this thread, birds will 'survive'...