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An occasional weird egg from a hen may be no big deal. But if you find a firm, egg-like blob, it may be what’s called a “lash egg,” and you should take note. Lash egg occurrences can be an indicator of a serious reproductive problem.
A lash egg is an egg-shaped mass of mostly pus, but it may contain yolk fragments and tissue bits from the hen’s reproductive tract. It is almost always a solid, firm, rubbery mass without a shell coating around it. It may have the shell membrane coating around it or possibly a fragile, thin shell coating.
For more information about lash eggs, visit "What Is A Lash Egg?" on the Meyer Hatchery blog