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My female duck has been laying for about 5 months buy none have ben fertilized by the male how old does the male have to be to make fertile eggs

I have 2 ducks and the female is laying eggs but their not fertile how old does the male have to be to make fertile eggs

I have 2 Blue sweedish ducks and they are 1 years old and I want to find out old the male has to be to lay fertile eggs