A bird’s reproductive system is very different from a mammals, specifically because they don’t have penises or vaginas. Each time a yolk ripens, the sperm will fertilize it provided it is in the hen’s oviduct. It takes about 30 hours for a hen to make one egg. The white is created and then lastly the shell will form around the egg. How Does a Rooster Fertilize an Egg? The complete egg in the shell is past the part of egg production, inside the hen, where fertilization takes place. This method has largely been replaced by ICSI. Roosters do help fertilize chicken eggs so that they form into baby chicks but, since they don’t have penises and chickens don’t have vaginas, at least not in the traditional sense, there is no actual ‘sex’ that is performed and no pregnancy to speak of. Also, if there are no roosters , chickens can lay infertile eggs, suitable only for boiling and scrambling, have one and give me the other, which one do you prefer. Fertilized eggs are edible and look exactly the same as infertile eggs other than a small white bullseye in the yolk. You do need a fertile rooster to have fertile eggs. That said, roosters are sort of like human males: they will probably be fertile most of their lives! Veterinarians can artificially fertilize bird eggs by collecting a sperm sample and transferring the sample to the female’s cloaca. The eggs are most likely formed before the mating or is possibly fertilized by a previous copulation. In order for it to be a fertile egg, you will need the rooster to do his part. How do chickens fertilize eggs? If the hen has not mated and she lays an egg, then that egg is unfertilized. Without getting too graphic, I know a lot of people are curious about how roosters mate with hens and how they fertilize eggs. The chance that an egg being fertilized from the semen of that days copulation is very unlikely and closer to impossible. But the completed egg is not what gets fertilized. After about 10 days, start checking her eggs for fertility. If you want to hatch eggs from a specific hen and a specific rooster, you can be 100% certain of the “right” fertility by first housing the hen away from any roosters. For the eggs to be fertilized, the hen and rooster must mate first, and this process must occur prior to the formation of the egg. It's the yolk of the egg that gets made first. It won't develop unless it's been in … There are two techniques for fertilizing eggs . Thus, if the hen has mated and she lays an egg, then that egg is fertilized. Source(s): Associate Professor of Veterinary Research. And if you have a great rooster, it makes sense to allow him to fertilize eggs for as long as possible to pass on those good genes. Hens go through oviparous reproduction , which refers to the laying of eggs. An egg that is not fertile will have a pale irregularly shaped spot of cells on the surface of the yolk. 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