So as I was cleaning my stalls today I mulled over everything from this forum.
First off, the idea that DE would become not sharp when wet doesn't make much sense. At first i thought "oh like powder it gunks up" well yes it can a little, but it's more slippery than that and doesn't completely stick together. If you put a pile of razors in water it doesn't make them less sharp.
The other concern - could it be harmful to their intestines? Good thought, but i don't think so, not in the minute amounts it's given in. Think about how harsh their feed is but their stomachs handle that fine. The microscopic sharp pieces are so small thy only really damage anything microscopic, unless of course they have a rediculous amount.
I think new image also made a good point, the destinction between parasite control and deworming. I don't think DE would be good enough to take out a seriously wormy animal, but it's probably helpful in reducing the numbers or preventing an overabundance of worms. Whereas a commercial dewormer whipes out all the worms, thus it dewprms, not controls.
In my horse's case they have both had fecals and are 'within healthy levels' and don't need to be dewormed but the vet said i could if i still thought it needed. I will probably give them a bit of DE occasionally, but continue to get fecals every so often to make sure they're still within comfortable levels.
This has been quite enlightening!
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