fertilized or not? hi guys.

[Chicken Ducks]

4 days ago I placed 8 day old eggs into the incubator. 15 eggs in total.

I've noticed that 2 of the fresher eggs are visibly fertilized. However I cant see anything happening in the other eggs.

So after 4 days, shouldn't I see some blood? Or should I wait another 3 or so days?

 

[Fred's Hens]

when are they visibly fertile?

Duplicate thread.