It's a personal feeling not backed up by science but I can't believe human children raised by a single mentally healthy and stable parent will do worse than those raised by two that fight all the time. I'm not sure how those studies compare what's comparable as social, affective and cultural background and so many other things would have to be taken into account.I'm going to sound crazier than usual but..,
I have no doubt that even the least complex incubators can and do hatch chicks. The various happy clappy hatchalongs on BYC show this as do the hatcheries. Do they hatch healthy well adjusted chicks though?
Even the best incubators are brick thick when compared to the adjustments a broody hen can make to a clutch of eggs and the incubator industry are well aware of this. They read the studies on incubation as it's in their interest and try to develope better incubators and better advice on their use for the commercial concerns.
Not that many years ago the Chinese did an experiment where they took babies from their mothers and reared them in a communal setting with no distinct parents and many other children. None of these babies got breast fed and I imagine none got the same level of affection or interaction with adults that a baby brough up bu it's own parents gets. The experiment got some publicity at the time but what didn't get so much coverage were the long term results. A very high percentage of these children showed difficult in many areas of social interaction in later life. The experiment got dropped to the best of my knowledge.
Despite all the gender complications that may seem common in todays western society it is still generally acknowledged that children raised with two parents (not necessarily male and femal, but two) fared better in many areas than those of single parents, or of no parents known to the child. Consider carefully that this our species with reams of studies and data on parenting and outcomes.
There isn't such data when it comes to chickens. Are chickens raised by a hen and rooster better equiped to deal with the social complexities they will encounter. The chickens social world is very complex when they are kept in captivity, no matter how benign that captivity is. They not only have to learn the social working of their own species but also that of their keeper, their keepers other pets, often a limited and inadequate environment and a constant threat of new predators depending on location.
It's parents that teach much of the basics for all these social complications in human society.
Of course, not many care if the chickens has mental health issues; after all, it's just a chicken...
Not may care if the chicken has long term health issues from how it was treated when growing up, diet, handling, stress, etc etc all play there part in human stability and health. I can see no reason why this doesn't apply to chickens as well.
I also can't believe that all chicken owners are careless about them. I think many who raise them as pets are very worried about their well being, but have not sufficiently thought about these questions.
When I took away Chipie's eggs in the night to switch them with the eggs that Gaston gave us, I was reminded of those horror stories about babies getting switched in the hospital by mad nursesI can't help feeling that eggs are meant to be laid in a nest and then left alone until the hen decides the clutch is big enough and sits on them.
Posting, driving them around, candling and all the other things people do just seems like asking for trouble imo.

I think maybe it's why she never left the nest more than 20 mn throughout the three weeks , whereas the day before she had gone sunbathing for two hours.
I don't see how it would be possible to leave everything to nature though for the reasons @Perris mentions. It would mean that only flock with a rooster would be able to reproduce and only through inbreeding.
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