How long after the act can ducks lay fertile eggs?

[bayyjayy]

I got a Buff and Khaki in August, and they are the only two laying. Sometimes the eggs have the bullseye on the yolk. There has been no hanky panky going on, so I find it very weird, though I think I read somewhere that it can be up to six months????

 

[DUCKGIRL89]

Sounds like one of your drakes really likes them

what breeds of drakes do you have, and how old are they?

 

[Miss Lydia]

Don't think it's that long, maybe 3 weeks at the most.

 

[dianaross77]

I don't know about ducks but chicken hens can store sperm internally and continue to fertilize eggs for around 3 months.

 

[iajewel]

30 days, if you really want to make sure, use 2 weeks as a guideline.