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Also, how does a rooster impregnate a chicken?

First things first, a rooster does not impregnate a hen. Hens do not get pregnant, they lay eggs which can be fertile or not. Eggs are fertilized when a rooster mates with a hen. It's not sex as we think of it; roosters do not have penises and hens do not have vaginas in the same way that mammals do.

Likewise, how long does it take chickens to mate? The average duration of fertility from a single mating is 10 to 14 days. 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. After about 10 days, start checking her eggs for fertility.

Also asked, why do chickens mate?

The cloaca, or vent, of the male and female touch and sperm are exchanged. It's called a “cloacal kiss” and requires a bit of avian gymnastics for both birds to position themselves so their cloacas meet. The other is to transfer sperm to a hen. A hen doesn't need to mate every day in order to lay fertile eggs.

Do Roosters have balls?

Rooster testicles are larger than you might think, but they need to be. A rooster is expected to be up at the crack of dawn, crow his heart out - then "service" 20 or more hens during the day. More on Chickens. Rooster testicles are like little sausages.