Time frame for fertile eggs

[bee_wrangler]

I am trying to find the time frame for eggs to become fertile? My buff brahma has been laying 1-2 eggs a day and I just got a buff brahma roo and put him in with her. I would like to incubate the eggs, just not shure when the fertile ones will come after the roo does his thing.

 

[rocketdog312]

I've heard it can take up to a week. But if you want to be sure, just crack one open after you have seen him mate with her. look for a light yellow dot on the top of the yolk. If its fertile, it will be similar to a bullseye. if its not it will just be a dot, or not there at all.