I would have thought it would be ok
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
After three times of losing all your eggs, there's definitely something wrong. What temp and humidity do you incubate at, and what kind of bator are you using? Also, if you are opening the bator after lockdown that could be damaging the eggs. :/
I dry hatch. My bator is at 99.5 and stays around 30% for humidity. Sometimes a bit higher and every once in awhile a Lil lower but if it gets lower than 30% I add a Lil bit of water to it. I'm using a farms innovator circulated air incubator. I never open the bator during lockdown. My eggs always seem to die before lockdown anyway. I've had problems with the fan since I got it but that never affects the eggs.
Is this still-air or forced air? If still the temp should be closer to 100.5. I'm also not sure if ducks are able to do dry incubation, mine never went below 40%.
Also, where do you get your eggs? Are they all from the same source? Sometimes the age and health of the parents can affect the eggs' viability. It sounds as if they're just not strong enough to break through the air cell membrane and just give up.