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I suspect the key is that the large chicken/egg producers want minimum standards they can get by with. Makes no sense to feed a chicken an optimal diet when you are going to slaughter it at 1.5 years or whatever, long before it has lived a normal life span. We can stay alive a while on an inadequate diet.
There is a big difference between minimum and optimum. I'll bet the research on what is optimum isn't out there.
Agreed. My girls have "free choice" layer feed, but go nuts for high protien treats. . . I figure it's got to be good for them. . . .