Brooding call duck.. few questions

[Call duck Jen]

Hi all, i have a broody call duck sitting on 13 eggs.. not sure if all hers as have 4 females laying and one lucky Drake. I need to candle them but does anyone know how long a duck remains fertile for after mating? Any help appreciated. Thanks

 

[EverythingDucks]

Welcome to BYC!
Females will stay fertile for 14 days.

 

[Call duck Jen]

Oh thats brilliant.. thankyou x