Oh, no!That's actually a nice question on which I have never given much thought about. I hatch my layer chicks under broody hens. However I do buy Cornish cross chicks for meat. I brood them in a sectioned off part of the coop where they spend rest of their short life. I do it perhaps for convenience sake. I can't think of anyother reason.
I keep atleast 24 different breeds of chicken. I highly recommend Rhode Island Red breed as your first flock.
Rhode Island Reds are synonymous with backyard chicken keeping and one of the most popular chicken breeds around.
They are friendly, easy to keep and very tough. Should produce upwards of 250, medium-sized, brown eggs per year.
Other breed that I would suggest is Barred Rock. Should produce 200, medium sized, brown eggs per year- they also lay during the winter. They are a very active bird who performs best as free-range and would make a perfect backyard chicken. They are also extremely friendly with humans so great if you want to train them to eat from your hand!
I personally don't like Orpingtons. They are bulky, food conversion ratio is low, not very active, they are vulnerable to predation, they can be very broody. However they are certainly not the worst breed that you can have, they sure look good.

I adore our Orps!
