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Hi Matt...
Yes, your experience, by definition is anecdotal ("non-scientific observations or studies"). Your population is too small, there are too many variables, and there's no control group. The results alone aren't enough without the steps in between. I'm sure your high school science and math teachers taught you that. I remember all too well the phrase.... "Show Your Work!" Just writing down the final number wasn't acceptable. Exactly like you just said... being advised at the feed store or the breeder isn't enough. (wink wink) You didn't mention how you determined that DE has no effect on shells? Vitamins D & K, and magnesium are not calcium, but with it our bones become stronger by helping us better use the calcium we take in. Not that long ago doctors would have called that information BS. DE has a pretty big number of additional elements, perhaps that's the key to it's results.
I appreciate your experience, but in this particular case I think a controlled research project, published by and presented to the scientific community probably trumps anecdotal experience and speculation.
On the other hand, instead of feeding DE for extra calcium, maybe I should just feed them lots of spinach every day since we know it's an excellent source of calcium. Between my and my neighbor's garden this year, I have a ton of it and more is already planted for fall and winter harvest, too. Love that stuff.
Edited 8/20 to add....
I posted the SPINACH comment as a tongue-in-cheek poke at Matt. And since neither he nor anyone else commented on it, I want to make sure no one took me seriously. DO NOT feed large amounts of Spinach to chickens. Like rhubarb leaves, it contains high amounts of oxalic acid which binds iron and calcium. Some report that it leaches calcium from their bones.
Here is a quote regarding oxalates in rhubarb, taken from a document on plant poisoning of livestock from University of Vermont Extension:
"Some oxalates are insoluble and cause local irritation but the oxalates in rhubarb (and other
species, such as sorrel or dock, Rumex) are soluble, and cause systemic problems, especially
in the kidneys, or they can affect the electrolytes in the body, such as the balance of calcium
and magnesium. Poisoning can be acute, when large amounts of oxalates are consumed
quickly, or may be chronic, where smaller amounts are eaten over a longer period of time.
Low blood levels of calcium and kidney failure are commonly reported findings in soluble
oxalate toxicity. Affected animals will appear depressed, and may stagger and tremble and be
weak. Often, they will drink and urinate more as kidney function declines. Diarrhea may be
noted, and affected animals may die if the electrolyte balance is extremely deranged or if the
kidneys fail."
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