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How to Tell a Fertile vs INfertile Egg (Pictures)

post #1 of 621
Thread Starter 

Thought you'd like to see this since so many have asked how to tell if their eggs are fertilized. The first picture is an INfertile egg. The next two are fertile eggs at slightly different stages, but both freshly laid. Usually, you look for the bullseye/donut appearance, but there are different stages of development of even freshly laid eggs and the two last pictures demonstrate that. This is caused by cells in the center of the blastoderm dying off and leaving a cleared out area, making that bullseye appearance.
http://i61.photobucket.com/albums/h49/ClutchHutch/Miscellaneous%20Pics/INFertileEggPic.jpg
http://i61.photobucket.com/albums/h49/ClutchHutch/Miscellaneous%20Pics/FertileEggPIx.jpg
http://i61.photobucket.com/albums/h49/ClutchHutch/Miscellaneous%20Pics/FertileEggPic.jpg



From this web page:  http://www.hatcheryoffice.com/embryology/determfert.htm

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Come See the ALL NEW Blue Roo Creations, where every artisan is a veteran or the spouse of a veteran!

BRC Web Store Purchases Now Include Shipping! Or Shop BRC Etsy!

URGENT! Always Quarantine Newly Purchased Birds!
~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

 
 

 

 

 

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post #2 of 621

Super pics Cynthia!! Thanks for shareing!

Deb
Heavens Door Acres
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Deb
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post #3 of 621

Neat! Thanks!tongue

post #4 of 621

are all those fertile?.

post #5 of 621
Thread Starter 

No, the first one is NOT fertile. See the difference?

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Come See the ALL NEW Blue Roo Creations, where every artisan is a veteran or the spouse of a veteran!

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URGENT! Always Quarantine Newly Purchased Birds!
~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

 
 

 

 

 

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post #6 of 621
Quote:
Originally Posted by Silkelovr 

are all those fertile?.


Read the paragraph above the picture. The first one is not the other two are.

Speckledhen, it is possible that in the second picture of the fertile egg, that it is actually not dying. Rather, it could be entering late stage one or into stage two of development where the clear spot in the middle is the chick beginning to form. It only takes a few hours to reach stage two and that could easily happen in a day if hens are in and out of the boxes. Under a microscope you might even be able to see the primitive streak forming!

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Need egg candling reference pics? Click HERE!
2011 Coop build! Click Here!

 

I'm no expert, there is always something to learn, and my birds are livestock, so... yes, I may be quite blunt. wink.png

Reply
post #7 of 621
Thread Starter 

No, the embryo isn't dying. The cells are sloughing off and making an area thinner so it appears to have a bullseye. I didn't mean the embryo was dying, just certain cells. The last picture is further development from the middle picture. Here is the scientific explanation:

a Stage VII blastoderm is 2-3 cell layers thick at the periphery of the blastoderm and 5-6 cell layers thick in the center of the blastoderm (Figure. 1). If this developmental stage is viewed with the naked eye the blastoderm is a round uniform shape but is a solid white color with no donut shape. When examining a fresh egg, the white embryonic mass of cells may look similar to Figure 2. As development proceeds, cells from the center area of the blastoderm start to die off due to a pre-determined genetic program that tells the cells to die (apoptosis). These dying cells fall into the subblastodermic cavity (Figure 3). The death of the cells progresses producing a transparent thinned-out area in the center of the blastoderm. This thinned area is only one cell layer thick, while at the periphery of the blastoderm the cell mass is still three to five cells thick (Figure 4). This cell shedding produces a Stage X of development and is the most common stage of development in a freshly laid chicken egg. At Stage X, light passes through the thinned one cell layer thick area of the blastoderm, but is reflected off the 2-3 cell layer thick area at the periphery; this effect produces the donut appearance of the blastoderm (Figure 5). The center or transparent region is called the area pellucida and the peripheral area that forms the donut shape is called the area opaca. It is only the cells of the area pellucida that will eventually form the cells of the embryo.


Edited by speckledhen - 9/7/07 at 4:18pm

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Come See the ALL NEW Blue Roo Creations, where every artisan is a veteran or the spouse of a veteran!

BRC Web Store Purchases Now Include Shipping! Or Shop BRC Etsy!

URGENT! Always Quarantine Newly Purchased Birds!
~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

 
 

 

 

 

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post #8 of 621

Haha, I get it now. I read your sentence wrong. Cells are dying, not that it is dying.

Need egg candling reference pics? Click HERE!
2011 Coop build! Click Here!

 

I'm no expert, there is always something to learn, and my birds are livestock, so... yes, I may be quite blunt. wink.png

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Need egg candling reference pics? Click HERE!
2011 Coop build! Click Here!

 

I'm no expert, there is always something to learn, and my birds are livestock, so... yes, I may be quite blunt. wink.png

Reply
post #9 of 621
Thread Starter 

I was actually glad to find the first fertile egg pic without a clear bullseye because I just had an egg that didn't seem INfertile, but also didn't quite look fertile, as I was used to seeing a fertile egg. I just wasn't quite sure, but I had a feeling. That particular picture confirmed that the egg in question was probably fertile, to my delight.

Come See the ALL NEW Blue Roo Creations, where every artisan is a veteran or the spouse of a veteran!

BRC Web Store Purchases Now Include Shipping! Or Shop BRC Etsy!

URGENT! Always Quarantine Newly Purchased Birds!
~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

 
 

 

 

 

Reply

Come See the ALL NEW Blue Roo Creations, where every artisan is a veteran or the spouse of a veteran!

BRC Web Store Purchases Now Include Shipping! Or Shop BRC Etsy!

URGENT! Always Quarantine Newly Purchased Birds!
~A dog on its owner's property is a pet; A dog on someone else's property is a predator~

 
 

 

 

 

Reply
post #10 of 621

Wow...how timely!

My son was just asking me (about an hour ago) about fertilized eggs and these pictures are great!  I was trying to tell him about the bullseye...I think he was picturing something way different...lol!

Just so we have this right...egg #2 and egg #3 are both freshly laid eggs...just at different stages...maybe a hen that lays everyday and one that lays every 3 days? (just for examples sake?)...is that correct?

Thanks for posting these pics and the info! 

BTW...I asked him if he would eat egg #3 and he shrugged his shoulders and said "uh...why not?" (good kid...hehehe)

Lisa

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