ring versus solid disk on yolk

FairfieldChicks

In the Brooder
10 Years
Sep 3, 2009
91
2
39
Burford, Ontario
I read somewheres a while ago that when you crack open an egg, if there is a ring instead of a solid white disk where the tiny disk is on the yolk, that it means it is fertile... anyone know if it is true?
I have checked several eggs compared to store bought eggs and it seems true since my chickens are with a rooster...
not a great pic, but the clearest I could get. The white ring is in the centre on the top of the yolk
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Last edited:

tnchickenut

It's all about the Dels!
9 Years
10 Years
Jan 24, 2010
2,716
32
181
Englewood, TN
Yes, it is true. It is called a "bullseye". If you have a solid white spot... that is infertile... if youhave a white ring, yellow ring, then white dot (even if it is very faint) then it is fertile. Problem is... you just cracked it!
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However, if you plan on breeding and selling hatching eggs, it would be wise to crack three or more open a week to check. Random QA checks. Also, it is useful in discovering if eggs that candled clear were infertile or just didn't develope. Here is a tip, though... eggs straight from the incubator are warm... the yolk is more runny then. I put my hatching eggs I'm going to check under cold water for a few minutes and it firms up the yolk so I don't destroy it when I open the egg up to check.
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