I have about 24-30 free ranging chickens. I started out with "game"(you know the fighting breed) chickens because we have hawks and other preditors here so bad that everything kept getting eaten!!
I mostly got them to turn my horse manure into dirt quicker. I now have more laying breeds and love getting and giving the eggs.
One good thing about free ranging hens.... it makes the horses less spooky about something flying around them.
Some days the horses will come into the barn when I'm feeding and the chickens are scattered all about.. the hens will fly up and swak loudly.. The horses spook slightly but nothin like they use to!