I love natural broods! But some hens are not good mothers and many of the chicks are killed off with a poor mother. That always upsets me. Indeed, some hens will kill the chicks themselves occasionally. When I get a successful natural brood raised up, it overjoys me to this day! Araucanas and later Ameracana Bantams made excellent mothers and I had good success with barred rock hens and "some" Buff Orpingtons that decided to brood and raise chicks. Results with most breeds has been spotty at best. I am a bit lazy about interfering much and that could make a difference. I usually incubate most of my replacement chicks or buy them as day old chicks.