After having a clutch nearly destroyed last year due to flies I decided to use the closed container method this year. I have been letting air in every few days for the first 40 days or so. Then once everyday. I decided last night to poke a few holes in the lid and laid fly tape loosely on top. The flies were horrible a couple weeks ago. The eggs are due around the 8th. Results have been great so far. No flies at all. I even saw a baby move inside the egg while candling last night.
How often do you guys let fresh air in? Do you at some point during incubation just let the air in close to the hatch date?
Thanks in advance








