I think it may be wrong in this context. It came from Azygous who posts it on BYC as a minimum for acute use in egg binding and it may be the right dose to get contractions going in the acute setting.Where did the 600-800 come from?
Both @Shadrach and Purina (unusual bedfellows!) agree a laying hen needs about 4 grams a day. Several sources say 2 grams go into the egg shell.
So for maintenance I am giving way less than they need. But mine are on layer feed so in theory I am just topping up or overcoming poor absorption.
You therefore likely need to give more and that will be a lot of pills! You can get liquid formulations to syringe down the throat. I have got adept at giving even reluctant chickens a pill, but I am not sure I am confident enough to syringe or pass a tube. If you were able to do that it would be easier.
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