No, there is not.
Only if you want to hatch chicks. Then, no you don't have to.
Chicks hatch and know instinctively what to eat. Brood hens do not teach or feed the chicks.
People use chickens to lay (eggs), hatch chicks, raise for meat and to show them off.
Chickens only lay eggs. Baby chickens (chicks) hatch from those eggs and grow up. If the eggs are not fertilized, however, then they will not hatch. Those are the ones that are eaten.
Chickens do not get pregnant. Rather, they become broody and sit on their nest of eggs for at least 21 days to hatch baby chicks.
I believe you mean 'when do chickens become broody'. If this is what you mean it is usually in the Spring/Summer months that a chicken would like to hatch chicks. Although, not all chickens enjoy broodiness. Silkies, bantams and Orpingtons etc like hatching chicks.
Chickens lay eggs all the time, but these are not usually fertilised. When a cockerel mates with a hen, the eggs become fertilised and then, if the hen sits on them or if they are incubated, chicks will hatch.
Chickens do not need to mate in order to lay eggs. Hens will lay eggs regardless of whether or not they have mated with a rooster. However, if a hen does mate with a rooster, the eggs can be fertilized and potentially hatch into chicks.
Sounds like a late hatch. Most chicks hatch at or around 21 days but there are reasons they may hatch at 23 days. I just had two hatch from a clutch of eggs on day 24 and they are Araucana's.
Yes. When kiwi chicks hatch, they are fully feathered and well-developed.
you hatch eggs to grow the chicks into chickens for their meat and eggs to eat