I love that! I hadn't thought of it that way! You have my nerd brain really excited about this! lol

I keep more notes on things than is probably necessary, but I wouldn't know how the seasons and weather effect my hatches if I didn't.
My friend has been working on bringing Iowa Blues back from their "very rare" status. They're a beautiful breed and wonderful foragers. I raised one that had a slipped tendon that I wasn't able to repair (I'm quite certain it was due to an injury but he won't be used for breeding purposes anyway). I do seem to gravitate toward saving all the chicks, lol.
It will be interesting to see what eggs I get from these two (hoping they're both girls) and see if the shape of the oviduct could be genetic, causing the oblong eggs. I don't anticipate porous eggs from Dotty only because it's usually related to the age of the hen or their feed but I'll definitely try to update on that in about 6 months and stay in touch with my friend on the chicks she has as well.
I can say with a degree of confidence that I have done plenty of assisted hatches and raised those chicks, given them to friends with breeding flocks, and in turn hatched their eggs without needing assistance. I've done it several times with all sorts of assists, including malpositions. So while I didn't document the process quite as closely as this, I still feel comfortable saying that assists don't cause genetically inferior chickens and most assisting is probably more related to collecting, handling, and incubation practices. With the exception of the ones that hatch with obvious deformities such as missing toes or crossbeak but I haven't dealt with that much myself. I could certainly start trying to document more of that more closely as well!