I have a seabrite hen that is a really good brooder. When I got my flock back in early November, she was sitting on 13 eggs all from other hens, because they were big eggs I knew they weren't hers. She hatched two of them in the right amount of time but then after about another week she started either breaking the eggs or kicking them out of the nest. We candled a couple of them and they weren't fertile. It's amazing that she knew they were bad eggs. Just wanted to share that with you good folks. Magpie