Iowa poultry produce plants break out about 12 million dozen eggs a year. That leaves a lot of egg shells to be disposed of in some way. If these could be sold at a fair price, then egg buyers could afford to pay farmers a bit more for eggs. In the past, the shells have been a total loss to the egg breaker, and, consequently, to the farm producer of eggs.
Wilcke, H. L.
"Egg Shells Good Poultry Feed,"
Farm Science Reporter: Vol. 1
, Article 7.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol1/iss3/7