Well, when a bird is setting on eggs to hatch, she won't be laying.
Sometimes a broody will disrupt the flock dynamics,
depending on how you manage it,
and that can stress the others into not laying.
"Natural breeding"??
...isn't most breeding 'natural', not many use AI. :D
That line item should maybe say 'hatching with a broody hen'?
I have used an incubator, broody hens, and purchased day olds to get more layers.
Cockerels and older hens are slaughtered for meat to keep the winter...