I agree with Chickens Really,,
do not do anything to the egg,
you are not sure what the hatch date is.
Poking a hole in the shell is never good advice. especially if you do it too soon before it is ready to hatch,
it will almost certainly make the duck die.
I am 74 years old and have been at this hatching game for 40 years.
I hatch all kinds of eggs.
I have 3 incubators with a total capacity of 1400 eggs. many times I have no room for any more..
right now I have over 100 duck eggs due to hatch on the 4th of July..
The point is " I think I know what I am talking about.
do not do anything to the egg,
you are not sure what the hatch date is.
Poking a hole in the shell is never good advice. especially if you do it too soon before it is ready to hatch,
it will almost certainly make the duck die.
I am 74 years old and have been at this hatching game for 40 years.
I hatch all kinds of eggs.
I have 3 incubators with a total capacity of 1400 eggs. many times I have no room for any more..
right now I have over 100 duck eggs due to hatch on the 4th of July..
The point is " I think I know what I am talking about.