First time I have had one of our SilkiexBantam Cochins go broody. She weighs in at 1.25-1.5 pounds or so, and we tried prison for a day as she was brooding an empty nest. My 5 pound chicken do fine with 13, but I have a box full of eggs and started her off yesterday with 4. I doubt all of the eggs are fertile and do want her to get a bit of a reward at the end. I am not worried about loosing eggs from our plates from eggs being kicked out and infertile. She does not need to run but 1 yard to the feed/water station.