Well. It's difficult to answer that.
supplies needed:
)Flashlight
)Egg
What to do:
After the eggs have incubated for around 6-7 days, you can candle, to see
whats going on in the egg, and whether or not the egg is fertile. Take the
flashlight and egg, go into a dark room, simply hold the flashlight under the
egg, and you can see inside. A fertile egg will have cloudiness, mass, and/or
veins. An egg that is
not fertile will be totally clear inside. If you candle
to soon, you will not be able to tell anything about the egg. Don't get into a
hurry, you could risk dropping the egg. Eggs can be out of the incubator for
about 20 minutes before actually starting to cool off, so theres no need to
rush candling, take your time. You need to look for specific signs that the egg
may be dead. Blood rings, are a sure sign the embryo was living at one point,
but now dead. Bloodrings normally occure once bacteria has somhow entered
the egg. Pictures of bloodring:
Same egg with bloodring, but cracked open:
Porous eggs are also somthing you should look for. Porous eggs can hatch, so no
need to throw them out, but normally they have a lower chance. Picture of porous egg:
This is what a chicken egg should look like on the 7-8th day of incubation:
You can see the veins, and the embryo.
Always wash your hands before handling or turning eggs, and be sure your hens
are nice and healthy, and have clean nest boxes for healthy eggs
Here is a VERY helpful link, Please check it out.
https://www.backyardchickens.com/forum/viewtopic.php?id=261876
Good luck!
ScissorChick