Fertile egg or infertile?

[won023]

My own hatched ducks have started laying and the drakes seem to mount often does this egg look fertile? As the disc looks big ish...

 

[Skipper81]

If the Drake's are young and mounting they are fertile but there won't be a bullseye until a day or 2 of incubating the eggs

 

[won023]

The Drake is around a year old and the female is 6-7months old and thabks!

If the Drake's are young and mounting they are fertile but there won't be a bullseye until a day or 2 of incubating the eggs

 

[aart]

but there won't be a bullseye until a day or 2 of incubating the eggs

Really is that true for ducks?
It's not true for chickens, think the bullseyes is visible even if breaking an egg laid that day.

 

[Skipper81]

Nope I get 15 fertile chicken eggs everyday an none have bullseye's lol. I know they are fertile because my roosters are 8 months old and I have 5 roosters.