Question

What is first borned egg or hen

Answer 1

The hen came first.
It is believed that there was a proto-hen at first that gave rise to present species of chicken.

So that proto hen was first to come

Answer 2

It was hen which born first. Scientists have discovered that the shell of hen's egg is made up of a protein which can only be made by a hen. No other birds can lay that egg. They suggest that the first hen might have evolved from any other creature.

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Hope my answer helped.... ^_^