Agricultural Extension Service, South Dakota State College
A recent study by the Research and Marketing administration showed that. South Dakota farmers are marketing only about 40 percent top quality eggs at the produce stations or first buyers. South Dakota is an egg exporting state and has to depend on Eastern and West Coast markets to buy three of every four eggs it produces. The consumers on these export markets are demanding a high quality egg, which leads to a great deal of discrimination against the low quality Midwestern eggs. Nearly all eggs are of top quality when they are laid. A very high percentage of the eggs can be held in top quality condition on the farm by proper care. Poor gathering practices and holding conditions on the farm are responsible for the largest portion of the quality loss in the eggs going to market. An egg starts to lose its freshness as soon as it is laid. This change is more rapid the first three or four days although it continues at a slower rate for weeks or months
Bonzer, Boyd J. and Lubinus, Louis, "Egg Coolers for Better Eggs" (1949). SDSU Extension Circulars. 534.