How can a hen have a shell formed in its stomach with calcium
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Around the egg is a membrane, and evenly spaced on the membrane are points where columns of calcite (a form of calcium carbonate) form. These columns stack together side by side to form the shell.
The nucleation points are defined protein nodules called mammillary protrusions, and the mineral is first deposited as particles of aragonite with random orientation of the crystal planes. On top of these aragonite piles, columns of oriented crystalline calcite begin to grow upward.
The calcite is basically floating in solution around the shell, and it deposits on the shell like a forming crystal. The egg grows its own shell!
The nucleation points are defined protein nodules called mammillary protrusions, and the mineral is first deposited as particles of aragonite with random orientation of the crystal planes. On top of these aragonite piles, columns of oriented crystalline calcite begin to grow upward.
The calcite is basically floating in solution around the shell, and it deposits on the shell like a forming crystal. The egg grows its own shell!
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The Eggshell: The eggshell is deposited around the egg in the lower part of the oviduct of the hen, just before it is laid. The shell is made of calcite, a crystalline form of calcium carbonate.
This entire trip through the oviduct takes about one day.
This entire trip through the oviduct takes about one day.
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