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sciencing.com/chickens-fertilize-eggs-4574069.html

Chickens — like other birds — lay fertilized eggs via sexual reproduction. Depending on the breed of chicken, a hen will begin laying eggs between five and seven months of age. The frequency of egg-laying varies between breeds, over different seasons, with moulting and with age, but most breeds that are used for egg production will lay an ...

www.reference.com/pets-animals/roosters-fertilize-eggs-589...

How Do Roosters Fertilize Eggs? A rooster fertilizes chicken eggs by mating with a hen before the formation of an egg. If a hen lays an egg without first mating with a rooster, the egg is not fertilized.

www.localharvest.org/.../facts_about_fertilized_chicken_eggs

You can see the white circle present in the egg yolk is more defined in fertilized chicken eggs than in their unfertilized counterparts. You can also see small red lines running along the surface of the egg yolk. People commonly mistake the chalazae, a white stringy material found inside the egg, to be the embryo, but this is not so. The ...

www.thehappychickencoop.com/how-are-chicken-eggs-fertilized

We all know that you don’t need a rooster to get an egg right?Our hens will lay an egg daily with or without any assistance from the male sex. However, if you want fertilized eggs, you will need a rooster need a rooster to perform his duties with your hens, which he will be happy to do on a continuous basis.

www.backyardchickens.com/threads/will-he-fertilize-their...

Will my bantam two year old Red Brown Cochin rooster fertilize the eggs of my now three month old Buff Orpington hens once they are old enough? I would very much like to keep him, but we do not want them to be laying fertile eggs because we'll be selling their eggs to costomers that will not want to find an embrio in their eggs. What do you say?

www.reference.com/pets-animals/chicken-eggs-fertilized-d...

For good egg production, chickens need approximately 16 percent of their diets to consist of protein. Pasture-fed chickens need more protein to produce eggs of comparable quality and quantity, especially since chickens with plenty of access to grass tend to stop foraging for other kinds of food and need their diets supplemented.

animalsake.com/how-are-chicken-eggs-fertilized

Only when there is a demand for fertilized chicken eggs, or when they (poultry owners) need a new batch of egg-laying hens, that they search for a rooster. In short, you may not be able to hatch chicks by incubating table eggs, as there is no guarantee that such eggs are fertilized or not.

gentleworld.org/a-chickens-relationship-with-her-eggs

In fact, a chicken’s nesting instincts are so strong that they will continue to try to build a brood whether or not there is a rooster present to fertilize their eggs.* * It is believed that chickens cannot tell which eggs have been successfully fertilized.

www.backyardchickens.com/articles/eggs-and-fertilization.62958

This is a comprehensive, clear, and very informative article on eggs and fertilization, written by an academic who apparently teaches poultry management for a living. So it is probably accurate, it has much about chicken anatomy and mating behaviour, and is certainly very detailed.