eli5 how are chickens or chicks all hatched at once?

Question

So chickens, they lay 1 maybe 2 eggs a day. Every day. But then they hatch out 10 or so babies all pretty much at once. Or at least in the same day. So how does that timer work? Do they just go into over drive and lay them all at once? How come the first egg laid doesn’t hatch long before the last egg? How does that genetic timer work so they are all “born” around the same time?

In: 4

Answer 1

I’m sure wild chickens do have chick’s hatching all the time and not synced up.

In the hatchery, they put all the eggs in the incubator at the same time and that’s how they get so many to hatch all at once.