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Do bird eggs gain weight during development?
Posted on March 28th, 2009 1 commentDo bird eggs gain weight during development. I know its pretty much a closed system other than to oxygen and gasses but you would think that with the cells dividing and muliplying that their would be some weight gain, just like fat and muscle and bone all have different weights you would think that the cells developing into different tissues would have different weights and cause a weight gain in the egg overall.
when i say different weights i mean that if you had a cup of fat, a cup of muscle and cup of bone each cup would be a different weight.Related posts:
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Bird Eggs Bird Eggs, cells, egg, gain weight, gasses, muscle and bone, Oxygen, tissues, Weight Gain, weightsOne response to “Do bird eggs gain weight during development?”
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haysoos2 March 28th, 2009 at 04:15
Fat and muscle and bone don’t have different weights. They have different densities. A pound of muscle and a pound of bone both weigh one pound.
There may be some minor intake of mass through the incorporation of atmospheric gases into the embryo, but I suspect they are outweighed by the waste gases and water expelled from the egg.
Other than those, all of the mass that is going to be in the hatchling has to be supplied to the egg before the shell is laid down.
That’s actually one of the advantages mammals have in their reproductive strategy - it’s possible to nourish the embryo for much longer than would be feasible in an egg, and thus invest more energy in the young. Alternatively, it’s also possible for the mother to abort the process if resources suddenly become scarce - increasing the chances that the mother will survive to produce more offspring another day.
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