See how the egg industry's animal welfare, food safety and sustainability practices have grown over the years.
Eggs were produced in backyards.
Of the 76 million people in the U.S., 44% were farmers.
Most eggs produced in small flocks of chickens in farmyards.
Cage systems were introduced, because research showed many benefits to moving hens indoors.
While some farmers continued to use cage-free housing, use of cages became more popular.
Various programs were implemented to improve egg safety.
For more statistics on current U.S. egg production, .