An egg weights about 60g in average, and a hen 3kg, how the hen can produce every day something about 2% of it’s weight like this? Which kind of metabolism the hen have to achieve this?
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The short answer is that it is dangerous for them. Their lifespans are shortened and they die of some bone deficiency. Add that to selective breeding to serve our interests and not their health, and you have chickens that lay eggs like well tuned machines until their body has to choose between feeding their bones calcium or building egg shells… and it chooses the shells.
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