This process will begin with the formation of the egg yolk, it is produced by the hens ovary during the ovulation process- the yolk is referred to as the oocyte at this stage. As it travels down the oviduct, 12
it will be fertilized internally by the sperm of the rooster.
As it continues to travel down the oviduct it becomes covered with a white membrane called
‘vitelline membrane’, as well as some layers of the egg white or ‘albumen’. Still travelling further down the oviduct, a casing for the egg white and yolk will begin to form. Eventually, the shell will be completely developed, and thus the egg is completely formed!
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