tortoise
Wild Hare
fecal egg count. fecal egg count. fecal egg count. Do the whole flock. Cull the heavy shedders. 80% of parasite problem comes from 20% of the animals. or something like that, I don't remember the numbers. Remember the goal is not to eradicate parasites - which is impossible - but to keep the parasite load low enough that lambs are gaining well and ewes are holding condition well through gestation and lactation.
DE only works in a dry environment. The inside of an animal is not dry. It does not work on the inside of an animal. Just like Lazy Gardener was saying above. Great for other purposes - just not that one. There is lots of evidence to show DE works to prevent insect infestations in stored grain. It works to keep flies off a surface - I assume it makes it unpleasant for them to land on.
As far as my sheep, we do fecal egg counts annually plus if we note anything not-quite-right (which happened once, two failure to thrive lambs with high parasite load, they did not survive despite vet diagnosis and treatment). The last few years we've done one worming for ewes with ivermectin in spring. We don't have much problem with parasites here, other than those two ne'er-do-well lambs the one year. One was an orphan/reject, the other was a preemie from terminal c-section.
DE only works in a dry environment. The inside of an animal is not dry. It does not work on the inside of an animal. Just like Lazy Gardener was saying above. Great for other purposes - just not that one. There is lots of evidence to show DE works to prevent insect infestations in stored grain. It works to keep flies off a surface - I assume it makes it unpleasant for them to land on.
As far as my sheep, we do fecal egg counts annually plus if we note anything not-quite-right (which happened once, two failure to thrive lambs with high parasite load, they did not survive despite vet diagnosis and treatment). The last few years we've done one worming for ewes with ivermectin in spring. We don't have much problem with parasites here, other than those two ne'er-do-well lambs the one year. One was an orphan/reject, the other was a preemie from terminal c-section.