How long do geese need to be together before producing pure eggs?

[cgjsmith]

Ok so long story short i got my white pilgram males mixed with the white mixed geese I found one pure bred and put two of my girls in with him (they are not happy) Anyway how long do they need to be togather before I can call them pure bred eggs? is it 3 weeks like with chickens? thanks Crystal

PS I will have pilgram eggs for sale C