Susan,
I just received this from a Dr. that
is a parasitologist major. I have been finding out all I can about encysted
larvae because my new horse that I had for 3 mo. died from these and prior
worm damage. I was told that he had been wormed regular.
Dolly
Basic Information About Worming Products
1. The biggest problem we have with larval migration is with
the small strongyles - the large strongyles do not migrate.
The small ones encyste and cause problems.
2. Strongid C does not get the encysted larvae. It only kills
the ones that the horse ingests, and this is only for
approximatley 8 hours per 24 hours dose period. Strongid C
also leads to resistance. It is useful for some
applications- see below.
3. Ivermection does not kill encysted larvae.
4. Quest and Panacur do kill encysted larvae, if used
appropriately. Use in a horse that has not had regular
worming programs can be fatal due to massive kill off.
Also, with these wormers, do NOT overdose- use
only the amount of paste appropriate for your horses weight.
5. The best program is one of rotating products ( chemical
names, not brand names ) every 6-8 weeks, with a product
to kill encysted larvae in the spring and in the fall-
see below under regular maintenance.
Yearly Regimen
Feb. 1, an ivermectin product ( Zimectrin, Equimectrin
April 1, 5 days straight with panacur ( to kill encysted
larvae ). this needs to be given between March 15 and April 15
for this part of the country.
June 1, strongid paste
August 1, ivermectin
October 1, Quest 2 days in a row. This needs to be given
between Sept, 15 and Oct. 15
December 1, strongid
Regimen for a new horse whose worming history is unknown,
no matter how good he may look:
1. Strongid C daily, as directed on carton, for 2 weeks continuosley.
This will kill off some of the more susceptible worms, and reduce
the kill off in the next stages.
2. After this, at the end of second week, give Panacur paste.
3. Two weeks later, use an ivermectin product.
4. One month after that, use Quest ( one dose only ).
5. Then start the year;y regimen.
Regimen for a horse that has been rotation wormed with
alternating ivermectin and strongid products over a long
period of time.
1. One dose of Panacur.
2. One month later, another dose of Panacur.
3. One month later, give Panacure 5 days in a row.
4. One month later, use one dose of Quest.
5. Then start yearly regimen.
The inportance of following these regimens:
All above regimens are designed to reduce the number
of the parasites in the horse so that when you give the strong
wormers that will get the encysted larvae, that you will not
cause such a massive kill off that you make the horse ill,
or at worse, kill the horse. There is a syndrome called
" winter syndrone", which occurs when you use a strong wormer
on a horse with a history ( known to you or not ) of inadequate
control of encysted parasites.This is part of why Quest has gotton
bad press. What happens, is that the kill off is more than the
horse can handle, and he becomes ill with colic like symptoms,
including inflammatory lesions in the intestinal tract. It is not
the wormer itself that kill the horse, it is the kill off.
If you start slowly on a new horse or one with inadequate control
of encysted parasites, then you reduce the kill off, and can
develop an effective preventive anti-parasite program.
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