Hatched 10 eggs with broody hen and they have been with her from the git go and I would swear they have more feather growth at 1 wk. than my chix i have raised in a box do at 2 wks. I know it doesn't work that way but have to refer to old pix if I can find them. Plus they hatched in may as opposed to the hatcherey chix normally gotten in february. Maybe because they have been exposed to cooler temps?(even tho with mom she had them out in 45 degrees with no problem-I would PANIC if my artifical brooder had gotten that cold).