This process begins with the production of egg cells from the hen’s ovaries. The egg moves along the bent and folded fallopian tube. During the movement, the egg turns into egg yolk, and a yolk membrane forms around it. The structural fibers begin to form, and then the albumin layer becomes protein.
As the egg being produced moves down the fallopian tube, it turns, twisting the structural fibers that hold the yolk. The inner and outer membranes are then formed, and finally the egg comes to the last part of the fallopian tube, where the outermost eggshell is formed; the eggshell is composed of calcite crystals of calcium carbonate. After about a day, the hen will push the egg out of the body through the cloaca and give birth to the egg.