A HAPPY VET SAYS…
I started using DE when we got problems with external parasites with chickens. I put it in nesting boxes, wood shavings on the shed floor and into their favorite sand bath places. We have never had any problems since. I have used it on mites in pigs as well, even in the ears (mixed into olive oil and with some garlic and rosemary added – without any bits of course) and it stopped the itch.
I feed it to the chicken, the pigs, my horse, my dog and the cats (roughly 2% of the dry feed). I check regularly for parasites in all of the animals. We were relatively problem free. No parasites so far in chickens or dog (cats not checked, because not tame).
Horse, pigs, sheep had and have fluke (possible reasons: 1) mostly live on grass, therefore dose of DE in total diet relatively low; using same/similar fields; 2) particularly good conditions over the winter for fluke; 3) fluke lives mainly in liver and bile ducts, therefore they only have a very short exposure to the DE when taken up).
Adult pigs when tested have been negative for worms, but a previous set of piglets had problems with Ascaris (possible reason: they were kept in, because we didn’t have a field for them to go out and graze). DE doesn’t keep animals free from internal parasites (but neither do wormers, a lot of resistance), therefore I keep testing, and hope to control the parasite load in animals and fields with DE and additional measures as field rotation, crap collection (only horse mind ;o) and if needed use a wormer.
I feed DE as well as a supplement, because it contains a lot of (trace) elements of nutritional value. I order from Willowfarm, because the service is very good and good value for money.