you keep them in a pen eather out the back or around the house some were and you need to clean out there pens every 2-3 weeks and its not hard to feed them or give them water or to keep them alive and they live for about 4- 8 years and if you live in the city then its best to have 3 or 5 so it doesen't anoy your neighbours.
Nope.
Most likely, a farmer will keep hens so he has fresh eggs to eat for breakfast and fried chicken for Sunday dinner. He may also keep lots and lots of hens because he is wants to make a living selling eggs to grocery stores. Then you can buy them and have eggs for breakfast too.
to keep the hens warm
Unfertilised, all large companies keep their laying hens separate from their breeding hens and cockerels.
in 1950 you could keep 6o in one cage
A good ratio is 1 rooster for every 15 hens. Many farms keep more hens than that and only one rooster, but that keeps him very busy.
Most egg producers will cull the flock when they reach about 18 months old.
It's a maternal instinct - in the wild hens / birds sit on their eggs to keep them warm grow into chicks and hatch. Most eggs now are unfertilised but the hen retains the maternal instinct to sit on them anyway.
usually the ratio of hens to rooster is about 15 hens for every rooster. If you keep them separated an extra rooster is not a problem but in a flock of 24 hens,you will have some squabbling between the dominant rooster and the #2 .
To keep the Hens company until its time for Chicken and Noodles.
Yes. They need to keep warm especially when they have young.
He willmate with them, unless they are ginormous and he can get on them.