I have 2 rosters an EE and a Wyandotte I started isotating the Wyandotte from my EE girls, but how long do I have to wait till I know the eggs produced are no long Wyandotte fertilized ? He was very "active" with the girls.
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I would give it a full month. They are probably ok after 2 weeks, but just to stay on the safe side, I would wait a month. Stranger things have happened with chickens!!