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Introduction. Chickens -- like other birds -- fertilize eggs via sexual reproduction. A hen will lay an egg at least every other day starting at about three months of age, but the eggs will only yield chicks if the hen mates with a rooster. Most hens won't lay eggs in the evening, so if a hen's egg is ready then, she will likely hold it until morning. Once she does lay, she's ready to start forming a new egg. After mating, enough sperm may remain in the hen to fertilize her eggs for a week or more. A rooster only needs to breed the hen one time for her to be able to lay fertile eggs for 2 or 3 weeks.   Also   The passage of the sperm up the oviduct is rather slow s … o it may be a few days after the first encounter before the egg is viable. a chicken need a rooster to fertilize it's sex cell whatever it is   A chicken can lay an egg without a rooster but the egg can never be hatched. If the egg is fertilized t … hen the egg is able to hatch. 2 people found this useful. Fertilization: Sperm Penetrates Egg. It takes about 24 hours for a sperm cell to fertilize an egg. When the sperm penetrates the egg, the surface of the egg changes so that no other sperm can enter. At the moment of fertilization, the baby's genetic makeup is complete, including whether it's a boy or girl.  Not all chicken eggs are fertilized. Any egg that a chicken lays will be unfertilized unless there is a rooster around to fertilize the egg while it is inside the chicken. Chi … cken eggs are fertilized when a rooster is in with the hens. The rooster will breed with the hens to continute the chicken species. This is why eggs are fertilized. If you do not want your eggs fertilized, all you need to do is pull out the rooster, or roosters if there are more than one. This will cause the chickens to lya unfertilized eggs. When an egg is fertile it means it was in the beginning stage of hosting a baby. 3 weeks (21 days) to 4 weeks is when you can be sure that the hen's eggs are fertilized by the current male that she is breeding with. But, I've always had the idea that if a male is repeatedly breeding a female and the male is fairly young but mature, his sperm will flush out the weaker sperm of the other male.  Chick Brooder. It is a known fact that hens lay eggs. However, what is not very well known is that hens can lay eggs with or without the presence of a rooster. 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. If the hen has not mated and she lays an egg, then that egg is unfertilized. Note, however, that the embryo of a fertilized egg does not undergo any change or development once it is placed inside the fridge. It has also been said that a hen lays fertilized eggs for a week if it has mated even once. There, the sperm is nourished and released over several days. So the rooster does not have to mate with the hen each time she lays an egg to produce a fertile egg. Fertility only remains high for about 10 days before another mating is needed to increase fertility of the eggs laid. This is why eggs are fertilized. If you do not want your eggs fertilized, all you need to do is pull out the rooster, or roosters if there are more than one. This will cause the chickens to lya unfertilized eggs. When an egg is fertile it means it was in the beginning stage of hosting a baby. It takes an egg about 25 hours to make its way through a hen's internal egg laying factory. The egg can only be fertilized during the first 15 minutes or so of that journey. If the mating takes place in a Monday, Monday's egg is not fertile. It started its journey on Sunday. Depending on what time the mating took place and the egg started its journey, Tuesday's egg might be fertile. But it might not. But it might not. Wednesday's egg is almost certainly fertile. Notice that this is after a mating. A rooster does not always mate with each and every hen in the flock every day. Usuallyy a hen will stay fertile about 2 weeks after a mating, sometimes a little less but usually a little more. Whereas fertilized chicken eggs usually take exactly 21 days to hatch, most duck eggs take 28 days, apart from Muscovy ducks. As a general rule of thumb, the eggs of Muscovy ducks take 35 days, but once again, it can vary slightly depending on conditions. So, how long does it take for fertilized chicken eggs to hatch? The answer to that is 21 days exactly, although you need to bear in mind that this can vary, depending on a number of circumstances.
http://www.ehow.com/how-does_4574069_chickens-fertilize-eggs.html http://www.answers.com/Q/How_does_a_rooster_fertilize_the_egg http://www.webmd.com/baby/ss/slideshow-conception http://www.answers.com/Q/What_is_the_fertilization_process_for_chicken_eggs http://www.backyardchickens.com/t/458346/how-long-does-it-take-for-a-hens-eggs-to-become-fertilized http://www.localharvest.org/blog/26992/entry/facts_about_fertilized_chicken_eggs http://www.answers.com/Q/What_is_the_fertilization_process_for_chicken_eggs http://www.backyardchickens.com/t/513469/how-long-does-it-take-for-my-new-rooster-to-fertilize-the-eggs http://www.localharvest.org/blog/26992/entry/how_long_does_it_take
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