Odd 'pit-like' object in egg

[Tonyroo]

Looks like a tadpole egg, lol

 

[Rhode Island Annie]

Sorry, threw it out soon after the pic. Wish I had done that. Older hen- makes sense.Wondering if this means egg production is coming to a halt.

 

[aart]

Sorry, threw it out soon after the pic. Wish I had done that. Older hen- makes sense.Wondering if this means egg production is coming to a halt.

It's likely, at least for the year, then she'll molt.
How old and what breed?