Without understanding your explanation completely, I can say two things. If in doubt, you likely don't have enough ventilation. And secondly, if you are building your roof around a tree and it isn't completely enclosed, you likely will have a predator problem.
Chickens have tiny respiratory...
I'm not a genetics expert and I don't know how this pertains to your situation. But years ago, I had an ongoing issue with white feathers showing up on black hens after their first molt. Not roosters but only hens. I had a discussion with a poultry genetic expert residing in Europe. She...
You obviously have something serious going on. On the surface it is likely respiratory but there could be multiple maladies affecting them.
There is no treatment until you know the nature of the malady. Most people don't have a poultry vet nearby or even an avian vet. But what you do have is a...
This time of year, depending on your latitude, day length is anywhere from 8 to 20 minutes shorter than it was a week before. That has a significant effect on ovulation, and a bird nearing point of lay will be delayed due to light/dark cycle effect on the pineal gland.
In general, undersized eggs don’t need any different treatment. They all need the same humidity, temperature and turning treatment. In my experience, females hatched from those eggs tend to lay undersized eggs.
I agree that stopping turning near the end isn’t a problem. The turning problem is...
I understand that but unless you have a reliable base temperature, you don't know what you are adjusting to accomplish. Until verified, you are working with unknown nebulous values.
The incubator thermometer cannot be relied upon. They are notoriously inaccurate.
I can almost guarantee, if you use a guaranteed accurate or calibrated independent thermometer