I have not turned any eggs in at least two years. 100s of Chicken, ducks, and quails hatch with 90% hatch rates.
I get extremely high hatch rates and can fit more in the incubator.
I have hatched several hundred eggs without adding any water at all to the incubator over the entire hatch. I live in a high humidity area.
Think about all the animals out there that come from eggs that don't get turned, why are chicken different? Snakes, Lizards, Turtles, frogs, spiders, ants, etc... these eggs don't get turned.
I don't think God designed the chicken egg to have special requirements and my incubation results support this.
I have also marked eggs under a chicken and most of the eggs don't move at all. None moved in a full rotation daily. The ones that did move are mainly due to chickens getting on and off the clutch.
Currently hatching Geese, ducks, quail, and chickens.
Duck and Geese eggs at the bottom of a clutch don't get turned by the mother at all.
Not really sure who came up with turning eggs but it has increased costs significantly. I have working chicken and quail egg turners and refuse to use them anymore.
Not trying to get anyone worked up but if you haven't tried that you haven't tried it. I have done it both ways and haven't seen a difference. Over 90% hatch rates continuously.
I also belief that my rates are high because I don't do anything once the eggs are placed. My incubator is accurate to the hundredths of a degree.
Thanks