Are pullets' eggs less fertile? I have 5 pullets ( different breeds, all 10 mos old) with one rooster. I've tried incubating 6 of their their eggs, but only 2 developed. 4 were clears. I'm so confused because I have been cracking their eggs and checking for the "bullseye" and all the different eggs have them. I'm giving a dozen of the eggs to my friend this Sunday for hatching. I hope she isn't too disappointed.