How do chickens lay so many eggs?

Question

I’ve heard chickens can lay eggs every 1-2 days. It baffles me that something so (relatively) big can come out of them so often. How do they produce so many with such limited internal space? How many are developing in them at any given time?

In: 2833

Answer 1

Up to 86% of eggs come from hens that have broken bones (caused by calcium deficiency as a lot goes into making the shells) and their bodies can’t keep up that pace for long, so they are killed while still pretty young. They are bred and exploited to their biological limits and suffer greatly for it, that’s how.

Edit: Source: https://www.popsci.com/cage-free-chicken-stronger-bones/