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https://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures

What was your "fertility time frame"? They can remain fertile for up to about a month after no exposure to a cock/erel. I remember a discussion on this, but only recall that it is possible for an infertile egg to have the bullseye but not what causes it. Bummed me out from a hatching aspect.