Expert please give detailed explaination of "Blood Ring"

Symptoms Probable Cause Corrective Measures
Blood rings Improper storage Follow recommended egg storage and gathering recommendations.
Improper incubation temperatures Check thermometer accuracy and incubator functions. Follow recommended temperature settings.
Improper breeder nutrition Feed breeders a diet with balanced nutrient levels.
Improper fumigation Follow fumigation recommendations.

http://msucares.com/poultry/reproductions/trouble.html#BR

 

Ive read it was when the chick started to develop, and then died, thus causing the blood ring.

 

Instead of developing a spiderweb of veins you will see only one around the bottom edge of the egg. Like all the blood pooled to just one vein. It is an indicator that you had a fertile egg at one time but it quit developing on you.

 

Blood rings occur when the embryo dies. The blood that was moving though the membranes stops when there is no live to continue it. The pooling forms the ring of blood we see when we candle the eggs.

 

I had 2 this batch, and both blood rings were around the center. I think the location varies.

Both had tiny embryos in them, but 1 was all dried up and the yolk was brown. It was educational, in a gross kind of way.

 

I agree kind of in the middle at the widest part of the egg but sometimes it runs up the side too at and angle.