i recently gave up on Manna pro oyster shells b/c noone was eating them. I went to the shore and recovered a bag of oyster shells. I think my girls are eating too much of it. Is this a thing? I wonder what can happen and also, how to identify a problem. Thank you and good luck!
Hens are unlikely to eat too much oyster shell.
It can happen, but it's not common.
When a hen doesn't get enough calcium, her body takes some from her bones to make eggshells, and eventually she just makes softshell eggs and has weak bones too.
If your hens were not eating the other oyster shell, they might be deficient in calcium, and trying to eat more now to re-stock their bodies. Or they might just think it's a new treat.
Depending on how much they are eating, I might try one of these:
--just let it happen for a few days or a week, and see if the rate goes down.
--or measure out some amount each day, and put out that much. I'm thinking maybe a Tablespoon per hen per day. That should be more than they need, even if they are making up for past deficiencies, but will prevent them gobbling up really enormous amounts.
I would expect your hens to settle down to a reasonable rate of consumption fairly soon, but of course not every chicken does what I would expect.
Do they also have grit available? If not, you might try putting out some grit in a separate dish, in case the hens want some of it too-- I've read of someone's chickens that were eating large amounts of oyster shell when they had no grit available (The person found gizzards full of oyster shell at butchering time, which is quite unusual.)