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Anyway, the problem that I thought I found was that the Ca:P ratio was of the order of 1:10 which, from all I have read on this forum, is not OK so I didn't feed them.
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Is that 1 part calcium to 10 parts phosphorus? If so that is extremely high so it would be better to feed them as a veryyyyy rare treat (once every couple of months) in very small amounts or not at all.
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The values on the USDA database can only be averages because they can't test every different variety of any vegetable.
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They are averages. Not only do they not test every variety of vegetable and fruit, but there are differences in the contents of veggies/fruits dependant upon where they are grown, the soil content, fertalizers used, insectisides used, amount of sunlight, etc.
Basically the charts just give us a rough idea of what veggies can be fed more often and which cannot. The values are not die hard values.