I have 3 hens that are laying. There are 14 eggs in the clutch. When will the hen go broody? Does there have to be a certain amount? Also, on some eggs there is a lot of poop, should I try to clean it off? I've always used an incubator but now I'm just about burnt out on using the bator. So I thought that I would try to let a hen go broody. Thanks in advance for the advice!