It's as I thought. You need to ignore the serving size. Your hen needs one tablet. That's how much is in one of those pills in that bottle. The serving size suggestion is only for humans, and it isn't based on anything other than to sell more of the product.
Let me explain further. Supplement manufacturers are required by law to state clearly on the front of the label what the strength of each pill is. In this bottle the label says it's 630mg. Now, all bets are off when they get to printing the back label. they can say what they want. Most supplement manufacturers will "suggest" you take twice or three times the amount a human body really needs. Why? To make more profit, of course. That's the reason they're manufacturing the supplement. In fact, too much calcium is very hard on the kidneys, animal or human. Why they are allowed to get away with suggesting so much is another whole discussion.
A hen in reproductive crisis needs around 600mg per day as long as she's in crisis. As soon as the crisis ends, unless thin shell or shell-less eggs are a pattern, no more calcium tablets should be given. If there's evidence the crisis was caused by poor calcium levels, then we continue giving the calcium tablets for another week or two. Kidney stones can result with too much calcium over a long period.
