how do I tell if my chicken eggs are fertalized?

[psinatra]

My chickens just started to lay eggs. Since this is my fist time at this I just wanted to know how do I tell the difference between fertalized eggs and those that are not.

thanks in advance for the help

 

[speckledhen]

Here are some pretty good pictures for you.
https://www.backyardchickens.com/forum/viewtopic.php?id=16008