[Jacob-list] Ivermectin and synthetic pyrethroids
patchworkfibers at alltel.net
Mon Apr 17 17:45:28 EDT 2006
Thank you, Gordon, for such a clear explanation.
I don't worm often and I'm glad that I don't. We still have tons of earthworms and moles (maybe too many moles).
When I dosed my sheep for lice, I used Permethrin as a pour on at a rate of something like 2ml/sheep. There was no dip to dispose of and I hope the impact on our creek life would have been minimal. Definitely something to consider if I ever treat them again.
Registered Jacob Sheep, Angora Rabbits, Handspun Yarn
On Mon, 17 Apr 2006 14:09:06 +0100, gordon johnston wrote:
> Ivermectin is lethal to invertebrates. It is an organophosphate and
> was I believe developed in Israel as a by-product of nerve gas
> research. If you give it to your animals, the dung is toxic to
> ground-dwelling beetles and earthworms. Its use is not permitted in
> organic production here in the UK. My neighbours use ivermectin to
> worm their cattle and sheep. They have very few earthworms and no
> moles. We do not use it and have millions of earthworms and lots of
> moles, 21 trapped in the last week. Pyrethroids are based on the
> insecticidal chemicals produced by pyrethrum daisies, but are all
> produced synthetically in chemical plants. They do not have the
> same dreadful effects on humans that ivermectin can have but they
> are phenomenally toxic to aquatic life. Disposal of pyrethroid-
> based dips is problematical.
> There is no easy answer to controlling flies and lice on sheep.
> Each will have adverse effects on the environment. I would suggest
> Vetrazine (approved for use in organic systems) which prevents
> maggots developing or Crovect (not approved) which kills maggots on
> sheep. Either is preferable to watching sheep suffer from
> flystrike. Gordon in Scotland.
> Jacob-list mailing list, sponsored by Swallow Lane Farm &
> Fiberworks Jacob-list at jacobsheep.com
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