Another egg question

[Dogwood Farm]

I'm sure this has been answered a thousand times. I thought when you found blood in an egg it was considered fertilized. I had an egg which I think was probably was the hens 1st or 2 nd to lay since it was misshaped and the shell wasn't perfectly smooth. I've been getting a lot of little eggs so I know I have some hens that are just starting to lay. This egg would have been a double yolker except one yolk was perfect the other was all blood. I had another egg with a lot of blood on the yolk and another with a little. I was talking with my Mom this morning and they use to raise chickens and sell egg they had over a thousand at one time back in the 60's. She didn't think a blood spot on an egg meant it was fertilized. What does it mean?

 

[Ridgerunner]

This link takes you to the blood spot section of the Egg Quality Handbook. It might help you.

http://www.thepoultrysite.com/publications/1/egg-quality-handbook/28/blood-spots

A blood spot does not mean the egg is fertilized and has nothing to do with a rooster. A blood vessel ruptured in the hen's egg laying factory while the egg was developing and some blood got in the egg. One of mine does that a lot. Haven't been able to figure out which one.