Well what about the "bullseye" ? Lol
I believe the hen can remain fertile for up to a month after being separated from the rooster.
THAT IS NOT A ROOSTER. the bullseye is the ova, not the sperm, I don't know if you can even tell if it was a fertile egg or not, but all eggs have the actual egg in there.
You can tell if an egg is fertile or not.
https://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures#post_132086
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