In poultry, what is the term for the outer layer of eggs?

The outer layer of eggs in poultry is called the shell. This hard, protective covering serves several important functions. It primarily protects the developing embryo inside from physical damage and environmental contaminants. The shell is composed mainly of calcium carbonate, which is a crucial material that provides the necessary strength and structure for the egg. Additionally, the shell is semi-permeable, allowing for the exchange of gases, which is essential for the embryo as it develops.

Other components of an egg, such as albumen (the egg white), yolk (the nutrient-rich center), and chalaza (the strands that anchor the yolk in place), each play different roles, but none of these are responsible for the outer protection of the egg like the shell does. Understanding these parts and their functions is fundamental in poultry science and egg production.