Eggshell thickness can vary based on the size and age of the hen. Hens produce a similar amount of shell material for each egg. As a result, smaller eggs often have thicker shells, while larger eggs can have thinner shells.
As hens grow older, they tend to lay larger eggs. The amount of shell material stays fairly consistent, so the shell may become thinner as the egg gets bigger.
What Makes an Eggshell Strong?
Calcium plays an important role in eggshell strength. Egg farmers provide laying hens with a balanced diet that includes the calcium they need to produce strong eggshells.
If a hen does not get enough calcium from her diet, her body can use stored calcium to help form the shell. Farmers work with nutritionists to make sure hens receive the nutrients they need for healthy egg production.
Ontario egg farmer Hubert explains more about eggshell thickness and hen nutrition in the video below.