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 Post subject: How does a rooster crow?
PostPosted: Tue Aug 28, 2007 5:55 am 
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Golden Cockatoo
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To understand how a rooster makes that magnificent {or annoying depending upon you point of view} sound you need to understand a little about the structure of the chicken's anatomy, and exactly HOW the bird makes the sound.

Firstly, birds have a much higher metabolic rate than people, which means they burn energy at a higher level, and therefore they require more oxygen. Puzzlingly, their lungs are quite small, but they have a complex system of air sacs throughout their body, 9 altogether, and the flapping of wings actually helps move the air through these sacs and hence the body. The next three diagrams show the distribution of the air sacs throughout the chicken's body.
*image missing*
ImageImage

Hopefully too from these diagrams it can be seen why respiratory illnesses are so crippling for poultry, as all the air sacs potentially become infected, and can become congested with phlegm.

In terms of the roosters' crow, the important structure to note on the top diagram is the trachea. Notice how it branches into two, and each branch, called the bronchi, goes into the lungs. Now, just before it branches, there is an area of slight thickness, called the syrinx. It can be seen in the photograph below just before the bronchi pass behind the heart. On the right of the heart, the reddish bubbly bit you can see under the probe is one of the chicken's lungs.
Image

Now you all will have noticed that as a rooster gets ready to crow he usually seems to take in a couple of deep breathes and flaps around his wings. What he is doing is filling up his air sacs.

When he finally lets rip he is blasting out through the syrinx like those tediously annoying blow out paper party whistles..........that is how he makes his crow :oops: :lol: :oops: :lol: If you watch and listen carefully, the noise is usually only on exhalation, with sometimes a funny little catch at the end. This is also why baby cockerels sound sooooo hilarious when they are learning to crow, as they have not yet learnt to control the vibrations of this cartilaginous structure.

Now all the clucky noises the rooster and the hens make come from the larynx up near the mouth. The crow comes from this structure buried way down deep in his chest.

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PostPosted: Tue Aug 28, 2007 6:50 pm 
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Golden Swan
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Great Ino Caladenia! I've never seen it clearly described!

NellyG

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PostPosted: Tue Aug 28, 2007 7:46 pm 
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Assist Admin
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Well explained Caladenia!





((It was in her syrinx that my little duck developed the fatal lesion. It is an area that can get shedding of tissue especially when green feed or vitamin A is in short supply))


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PostPosted: Sun Nov 04, 2007 5:24 pm 
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Great Game
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"How do roosters crow?"

By opening their mouth! :lol:

Na great article :P

Cheers

Ash :wink:


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PostPosted: Fri Jun 06, 2008 9:17 pm 
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Discerning Duck
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With a great deal of difficulty if the non poultry people have their way.
I thought that explanation was excellent. :)

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PostPosted: Sun Jul 20, 2008 5:35 pm 
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Proud Rooster
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I have a rooster that not only crows but cackles like a hen.........is this normal?????

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PostPosted: Thu Nov 13, 2008 6:05 pm 
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Fiesty Fowl
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Hmmm I don't get it,

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 Post subject: crowing
PostPosted: Tue Dec 02, 2008 11:49 pm 
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Dapper Duck
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hi everyone on the subject of crowing can young hens mimic roosters crowing

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PostPosted: Mon Jun 01, 2009 3:40 pm 
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Dapper Duck
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Hi Chookman Dave.

Yes, I've had a "top chick" hen who would give a warbled half attempt at a crow. Very bizarre. At least she kept laying eggs and didn't try "anything else".

Ann


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PostPosted: Fri Jun 26, 2009 12:40 pm 
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Proud Rooster
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So does that mean we have to wrap his wings tight to his body so he can't pump any air into his lungs...?


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PostPosted: Fri Jun 26, 2009 1:14 pm 
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Junior Champion Bird
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thanks!!


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PostPosted: Tue Jul 21, 2009 8:02 pm 
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Clever Cockerel
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Very interesting :D
I'd really like to know WHY a rooster crows :roll:
I've heard that their crowing in the evening is to round up women to roost, but why in the morning?
Please go easy if this has been asked a hundred times :oops:

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PostPosted: Tue Jul 21, 2009 9:53 pm 
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Golden Cockatoo
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i believe its a call to mark his territory, one reason you get lots of roosters crowing at show is they are saying this is my patch, no its mine, etc.

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PostPosted: Tue Jul 21, 2009 10:02 pm 
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Cool info, thanks. If you seperate 2 rooster into pens on either side of the yard where they can't see each other anymore, they say 'where are you' and the other one replies 'here I am' - Yes I have to much time on my hands!

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PostPosted: Fri Sep 25, 2009 12:12 pm 
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aaaaaaaahahahahaahaa


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