The triggering point of the egg-laying process for a chicken is its eye. Chickens receive a cue from a light source (natural or artificial) that enters the coop. This is the reason commercial hatcheries have an illuminating source. A photoreceptive gland that is situated near the chicken’s eye triggers an egg cell release from the ovary of the chicken.
Most of the species lay eggs almost on a daily basis. A single hen can lay up to 300 eggs every year. However, certain species release only one egg a month.
A small disk of nutritious material surrounds the egg cell that provides nutrition for its further growth. The uterus of the chicken fills up with albumen, commonly known as egg white. Meanwhile, a membrane that seals the albumen, egg cell and yolk forms following which the shell starts developing surrounding it.
The egg shell is a sturdy yet thin formation and is a mixture of salt, water as well as calcium. This is the reason egg laying chickens need a lot of calcium intake in their daily diet.
The outer shell takes the shape of the uterus wall and the narrower end points downward. The fully formed egg begins to contract and moves down a canal towards the vent which is also used for elimination of the waste. There is a flap which keeps the intestinal and vaginal track separate so that the waste elimination and egg laying process does not occur at the same time. While ejecting the egg turns and the wider end comes out first.
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