The Egg and the Adult

[Dustfinger]

Hi, I recently wondered whether birds in eggs excrete the same substance (uric acid) like the grown-up birds.
What d´you think ? Coz i heard something about chickens etc. excreting other things ...

[Dustfinger]

Hey, where are you all ?

[Dustfinger]

Huhu ? Nobody knows the answer huh ?

[Dustfinger]

It´s urgent ! Need the answer still today !

[Dustfinger]

Why ???
Anyway , found the answer in a book barely an hour ago. I was right, they excrete another substance first and then they switch to uric acid

[kilroykelim]

i was suggesting that you seek
more knowledge from the internet about this ok?cos ii don think we can tell you the answer right now
nice time peter

[Dustfinger]

Just read my post above:

Anyway , found the answer in a book barely an hour ago. I was right, they excrete another substance first and then they switch to uric acid

[Darby]

Your book is wrong. The reason terrestrial animals produce uric acid is to prevent toxification in the eggs.

[Dustfinger]

My book is right, and you´re right. In the first hours they "decide" which substance they excrete.
And i found this page on Sunday:
http://ex-anatomy.org/nitro.html
So i know it´s because of toxification in the eggs , but one of my books also states they produce more ammonia in the first hours .

[Darby]

It isn't so much a decision as a developing metabolic pathway. Ammonia is produced from amino acid degradation - urea (our main waste) and uric acid (found in sealed-egg terrestrial animals) have to be produced from the ammonia.