How to tell if an egg is fertile?

[Owenp_2]

You really only have two options:
1) Incubate for about a week, then candle and look for veins
2) Break out eggs and look at the little white spot on the yolk. Fertile eggs will have a larger spot - it may be an open ring, solid ring, or bullseye. Regardless, should be about 4-5 mm in diameter. Infertile eggs will have a small spot - usually solid, but irregular looking. This will only be about 2mm in diameter.

For a visual:

View this content on Instagram

View this content on Instagram

Assuming you have fewer than 10 hens per rooster, he should be able to cover them all. After introducing a new rooster to a set of hens, I will wait a week or so to start collecting eggs for incubation. You can spot-check for fertility by breaking out a set of eggs. If I break out all of my eggs from one day and they are all fertile, I can be reasonably sure my rooster is doing his job and the next day's eggs will also be fertile.

Okay, I´ll check the eggs soon.