They all supplement the feed..
1976 Book on Poultry Production by Card and Nesheim supplements with 12 minerals. No Infant formula has that many minerals. In particular they cite iodine and selenium deficient soils in the Great Lakes region.
Birth defect in livestock are around 1 per 500,000. US is 23rd in industrial nations for survivability after one year.
Seems that the Farmers aren't buying your claim, "You can get all your trace elements in your diet."
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