I would bet that the vast majority of mixed flocks are fed layer feed, and that almost none of them have problems.
That's interesting, but it's not really what I'm looking for. It's a description of a host of poultry disorders with a number of possible causes.
I just don't hold a lot of stock in this sort of stuff. People do all sorts of things believing they help - often things that are directly at odds with what they're trying to do. Our brains are designed to find and recognize patterns, and we often find them where they don't exist. Evidence is what is important here - I'll keep searching - they do a ton of nutrition research on these birds in the industry.
I was talking Hypercalcemia - but yeah, there can be a lot of causes - but it's most typically regulatory issues - thyroid related problems, vitamin B/D toxicity, etc - not diet that causes it. Most healthy animals can take a ton of calcium before they start having problems - it's usually animals with underlying issues already where we see hypercalcemia. There are some pretty robust pathways in the body to regulate this stuff.
