What are some reasons a rooster goes infertile? He was bred 4x with a sexlink,probably a couple weeks ago now, and he is in a pen with an orp hen, and 2 light brahmas. Well, one was killed 2 days ago, but i'm incubating her eggs. I set some eggs 16 days ago. All the eggs from him,were not fertile. I set more 4 days ago,and they don't look fertile. I seen veins in my green ee eggs,so its not dark shells preventing me from seeing veins.i'm gonna check again in 3 days but i already feel they're not fertile. I have seen bullseyes in my orps and light brahmas before, i know he mates them, he's done it right next to me while i vid others laying! He seems like he's shooting blanks, and i don't know why. Oh, he's only about 16 months old, and a chick was hatched from my a fam members hen that was brought over to breed,back in summer.