Posted by issyhotten on Oct. 1,
I understand that the original wormers
caused the worms to be excreted live. And modern wormers
actually kill the worms before they're excreted. But if
the horse eats the worms, surely they will be digested in the
stomach acids (ok they can live in the gut, but not in the
So a horse can't pick up worms from the excreted adult worms!.
And OK, maybe you don't want the local birds scoffing the
worming chemicals inside the excreted worms, so that could be
a good reason. But you still muck-out onto the muckheap,
so the birds can still get the chemicals?.
So why do people keep horses in after worming?.
Also some people don't exercise their horses after worming in
case they get colic - this I can understand if the horse has a
heavy worm burden and the little buggers all die off and start
rotting in the gut at once - but with regularly,
properly-wormed horses surely this isn't a problem?. OK - I
wouldn't worm the day before a 3-day event, but is it
necessary to keep the horse stabled for 24 or 48 hours - this
could cause colic in itself.
Also, if you are worming between changing fields, it seems
like a good idea to get the horse off field 1, worm it, wait
for a day to make sure they're not excreting eggs and THEN
turn out onto nice, clean field2.
Of course, with an unknown worming history I wouldn't ride for
a couple of days - but I wouldn't want to keep the horse
confined entirely to the stable either?
Ideas, Opinions welcome!. I'm quite willing to change my mind
given a good enough argument!.
Posted by LizCobby on Oct. 1, 2001
I think it's because they excrete
parasite eggs in their systems too. ( if they have them they
come out anyway, as found in worm counts) but perhaps more
And the worms them lay eggs on the grass and so it goes on.
But if kept in, worms get put on muck heap.
(Hence reason not to use this year's muck heap for fertilising
Checked with rep from Panacur re their 5 day Guard - he
confirmed only need keep in for first 24 hours, as any
excreted after that are non-viable- i.e. dead.
We time our worming to farrier's day, when they can stay in
from night before to following evening. ( To make sure all
caught and in with clean feet, whatever time he gets there)
Posted by issyhotten
But the eggs were put on the pasture the
day before worming anyway?
Posted by JanetGeorge on 5:47 pm on Oct.
I think the reason is eggs - rather than
the worms themselves. Although most wormers will kill
the worms, they do not kill all the eggs which would then be
re-ingested and re-infect the horse
There is also the risk of dogs eating the dung of horses
treated with Ivermectin (I think???) that is, I think it's
Ivermectin that is lethal to dogs, but I stand to be corrected
(the old memory is NOT doing too well today.)
I would agree re exercise. I would tend to worm after
exercise, the day before a rest day for choice, because IF the
horse has a heavy infestation, you can get colic as a result
of the wormer.
Posted by cervine
yes, Ivermectin kills collies and collie
crosses, and has been known to cause fatalities in other
breeds. Don't let Woofums lick the worming syringe!
Posted by WelshFox
I didn't know that some horse wormers
can be lethal to dogs! You really do learn something new
I'll put a notice up at the yard as there are a number of dogs
that run around all the time. Maybe they shouldn't be
allowed to run loose when the horses are wormed.
Posted by Ros B
We wormed Sadie when she arrived, of
course - the five day one, and Chrissie told me to make sure
that she didn't sweat up during those five days because the
rise in body temperature would make the wormer less
effective..... which would explain the 'no exercise' bit?
Posted by sunflower
I used to be on a yard where the horse
had to stay in for 48hrs after worming, which I hated doing as
it was such a drastic change to the horses routine and diet.
Now, we worm and then turn them out into a different field the
next day, clearing the old field within the next day or so.
Posted by sjm72
The thing about not sweating is NOT
relevant to worming - this is a vaccination thing!!! People do
get confused - you can worm and exercise straight away if you
want (within reason if it is a wormy looking bag of bones!)
You keep them in to allow any half dead worms (i.e. those that
may also go on to develop resistance!) and eggs passed out to
be passed out into the bedding so you can pick it up and put
it on the muck heap - which is why you should never fertilise
horse fields with horse muck - although if it is a correctly
built muck heap or muck midden where you compact it down daily
and keep it square it should get hot enough in the middle to
'cook' any parasites! The wormer will cause more eggs and
worms to come out that would normally pass out.
We worm after a morning turnout (i.e. lunchtime) and then keep
the horses in for two nights and let them out after exercise
on the third day - so there is only one day when they are
actually not turned out - but they are exercised.