Roosters

I'm a chicken farmer, and crowing is only heard from roosters. However, the hens do make a lot of noise by clucking though. I found the easiest way to tell the difference in sex of chicks is just looking at the external genitals.

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Isn't crowing limited to roosters?

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... most) you buy are simply unfertilized eggs laid by hens. Being a chicken farmer, I collect eggs on a daily basis and they aren't fertilized (the roosters are separated from the hens at the moment). So yes, they can lay them without being fertilized.

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