candling: can you tell the age of the embryo?

[Silattahoe]

I have a broody hen that has been broody for about 1 week. Today I took her out of the nest (as she never seems to leave on her own) and found 6 eggs. I candled and found that 4 were infertile and 2 fertile. I would like to know how far along these eggs are as I am considering adding some eggs from my other hens. I have only incubated once and can't quite remember what the eggs looked like at certain days of age. What I saw today were some faint blood vessels and a black spot that I assume is the eye. Any guess how old these embryos are?

 

[JHorn91180]

Hard to say without pics but I would say from what u just descibed they r between 5 and 7 days old.

 

[sumi]

Here's a thread with lots of pics you can use as reference: Egg Candling Pics: Progression Though Incubation

 

[Silattahoe]

Cool - thank you.