It's more common than most folks think to have two eggs involved when a hen becomes egg bound. When it happened to hens of mine, three total if my memory is correct, I had never heard of such a thing, but to have all three hens have two eggs hung up must say something.
Why does it happen? I don't know. But something in a hen is suddenly "off" and she releases two yolks nearly simultaneously, but not so close as to become a double yolk single egg. Instead, they become two separate eggs coming down one immediately following the other.
This "bounty" presents a problem when they reach the shell gland where there most often is only enough calcium to make a shell for one egg, usually the first one. The second egg is a shell-less egg. Often, the first egg gets stuck, and the hen is then in trouble. I tell people to always assume there are two eggs involved and to continue treatment for egg binding even though an egg has been expelled. Failure to continue treatment can result in the second egg being stuck or worse, ruptured.
Depending on where the egg gets stuck, the hen can die in less than 24 hours from the blockage and subsequent poop backup.
The treatment consists of administering a calcium citrate supplement immediately when the crises is first identified, and continuing with one tablet per day until the crisis has passed and the hen is laying normal eggs, one egg per cycle. This is the calcium I recommend as it's easiest and quickest to absorb.
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