Candling Eggs & Fertility

The pictures below represent daily stages of a dove's egg fertility that can be checked to verify if the egg is fertile or infertile.. If the "spider webbing" of the visible blood vessels cannot be seen after 5 days & the egg looks clear (see picture below of 11 days incubation of an infertile egg) the egg is most likely infertile & can be removed. I also have a picture below showing the embryo as it looks when the egg is chilled (parents abandon the eggs & incubation) & the embryo begins to die.
I used a bright flashlight under the egg in a darkened room. The numbers (15 & 5) seen on the egg represents another test that was ongoing while these pictures were taken.

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