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none I have found or looked up, just my own experience so far.
I began hatching this year in January - had still air, no turners, hatch rates were so-so. I probably had 50% - 60% hatch rates, which still isn't too bad.
added fans and turners to all incubators - hatch rates steadily climbed til about June when I was having 85% and higher hatch rates (yay!) I actually had a 98% hatch rate on one batch.
starting in late August hatch rates began to dump... maybe I got complacent or maybe it was the weather (turned really rainy for awhile, then hot and dry - kept swinging weirdly.)
The first batch of quail (eta - started these in late July / early August, I think) hatched out pretty well, IMO - but the second one, just three weeks later, was pitiful.
I am using this chicken hatch as a test of sorts, not only on who is fertile but as to what my hatch rates are goign to be this time around.
We did start the woodstove burning some this week, but it is beautiful out today, so I have the front door open. Temps are holding steady - humidity keeps going up and down, but not so badly that I think it'll cause a problem until Lockdown - then I want to make sure the humidity is good.
Hatch is due saturday - then have one due on wednesday, then Shelleys will be the last due.
meri