Circles on Egg Yolk

[CarolinaHiker]

I have backyard birds and I keep the eggs on the counter. Today I cracked some of the older eggs (maybe a couple weeks old?) And three of them had odd little circles on the yolk. Each circle is darker than the surrounding yolk with a paler dot in the middle. They kind of remind me of rot spots on tomatoes. There is no off odor.

I cracked some newer eggs and they didn't have those spots.

Any idea what these spots are and if it is OK to use the eggs?

 

[nuthatched]

That's the blastoderm, if your eggs were fertile and and you incubated them, the chick would start there.

 

[Chicken_tiger_catt]

I have backyard birds and I keep the eggs on the counter. Today I cracked some of the older eggs (maybe a couple weeks old?) And three of them had odd little circles on the yolk. Each circle is darker than the surrounding yolk with a paler dot in the middle. They kind of remind me of rot spots on tomatoes. There is no off odor.

I cracked some newer eggs and they didn't have those spots.

Any idea what these spots are and if it is OK to use the eggs?

nothing seems wrong to me.

 

[CarolinaHiker]

That's the blastoderm, if your eggs were fertile and and you incubated them, the chick would start there.

Thank you! I'll quit worrying about it then.