Egg disease or???? Please help

[cheezenkwackers]

Wait ? So you don’t have any humidity until the last week of incubating ?
I work a lady who hatched eggs daily(its her business) and she told me during incubating the temperature doesn’t have to be super exact ( I mean 99.2-99.8 ) but that it’s the humidity that kills them and she said to for incubating to keep humidity at 55-60 and at hatching do 60-70 percent humidity the only reason I could think of her saying that if it’s false is that she doesn’t have any ducks only chickens and turkeys. If so is there that big of a difference in incubating the eggs?

The key, is to watch the size of the air sac. I agree that the humidity kills, but too high. I do my chickens the same way. My last hatch (3 weeks ago), we got 14 out of 17 eggs. 11 were Silkies. I had 5/5 ducks hatch in September, the last time I did ducks. I am using an old styrofoam incubator with an external thermostat.