wrathsfarm
*this space for rent*
I'm no expert here, and probably shouldn't answer but here goes....I obviously don't have any advice but just a random thought: it's so interesting to me that a broody chicken will spend weeks on top of a nest... Only to kill the chicks that hatch. It seems counter productive. Why waste all that energy and nearly starve yourself keeping the eggs warm, and then kill your offspring? Does that happen with wild fowl or is it a product of domestication?
Just like with everything in nature including humans. There's no limitations to what a species is capable of doing to their offspring according to their mindset.
Some reasoning I've read that hens can be perfect sitters but once the chicks appear the hens are confused at this, viewing them as intruders or not theirs. Almost like trying to stuff day olds under a non broody hen.
In most cases these will be seen as intruders and killed. There are of course exceptions and rare cases I haven't experienced yet.