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Yikes, three different roosters, three different breeds, all the same response. I'd be really gun shy too. I wonder why it happens to some people and not to others. There has to be some additional factor, present for some but not for others, that's not being taken into account that increases calcium absorption. Maybe different vitamin/mineral mixes in the layer formulas, or different supplements given, or some native plant that imitates vitamin D, or something. That's the only thing that makes sense. It doesn't seem to be breed related, or age related, or regional. But it does seem that some people have lots of issues and other people have no issues. Nothing really in between the two extremes. It just goes to show that successful management is a total package, not just a single issue that can be transplanted from one farm to another with universal success.