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Deworming
Worms can be very distructive
to your horse. Here is a list of different worms and the damage
they can do:
- Roundworms, or Ascarids,
can cause colic, heart damage, liver and lung damage, and in older
horses and foals can injure the gut.
- Large Strongyles, (bloodworms)
can destroy arterial walls and blood vessels, impare circulation
and lead to colic, anemia, diarrhea, fever, unthriftiness, brain
damage and other disorders.
- Small strongyles can
lead to inflammaton of the intestines, resulting in anorexia,
weight loss and chronic low grade colic.
- Bots induce dental
disease, stomach irritations, ulcerations and perforations of
the stomach wall.
- Pinworms irritate the
horse's tail region, causing tail rubbing.
- Tapeworms may result
in severe ulcerations of the large intestine.
Horses need to be dewormed
every 6-8 weeks in order to stay healthy. It is a good idea to switch
dewormers every once in a while, to prevent the worms from becoming
ammune to one wormer. Also, different wormers kill different kinds
of worms, so if you rotate different dewormers, you will be sure
to kill all different kinds of worms. Here is a table on different
kinds of wormers and what they do:
Different Dewormers
| Drug
Class |
Active
Ingredient |
Brand
Examples |
Form |
Administration
|
Effective
Against |
Limitations
|
Benzimidazoles
|
Fenbendazole
______________
Oxfendazole
______________
Oxibendazole |
Panacur
______________
Safe-Gaurd
______________
Benzelmin
______________
Anthelcide EQ |
paste/granules/suspension
____________________
paste/granules/suspension
____________________
paste
____________________
paste/granules/suspension |
every
6-8 weeks
_______________
every 6-8weeks
_______________
every 6-8 weeks
_______________
every 6-8 weeks |
En
SS in h.d., L/S adult S, A, PW
_________________
L/SS, PW, A
_________________
En SS in h.d., L/S adult S, A, PW |
Increasing resistance to benzimadoles by some parasites. Ineffective
against bots. Allows reinfestation between deworming. |
Macrocyclic lactone
|
Avermectin
Ivermectin
______________
Milbemycin Moxidectin
|
Zimecterin
______________
Rotectin 1
______________
Eqvalan
______________
Equimectrin
______________
Quest |
paste
____________________
paste
____________________
paste/liquid
____________________
paste
____________________
gel |
every 6-8 weeks
_______________
every 6-8 weeks*
_______________
every 6-8 weeks
_______________
every 6-8 weeks
_______________
every 12 weeks |
Adult SS, LS, PW, A, THW, LW, HW, DH
__________________
B, L/SS, En SS Lrv,PW, A, HW, SW. |
Ineffective against TW and En Lrv stages of SS. Allows parasite
infestation between dewormings.
____________________
Ineffective aginst TW. Allows reinfestation between dewormings.
| |
PYRIMIDINE
|
pyranthel tartrate
______________
pytanthel pamoate |
Strongid C
______________
Purina Colt & Horse Wormer ______________
Strongid P
______________
Rotectin 2 |
pellet
____________________
pellet
___________________
paste
____________________
paste |
daily
_____________
every 8 weeks
_____________
every 6-8 weeks
_______
every 6-8 weeks |
L/SS, A, PW; D.P.C
__________________
L/SS, A, PW
_____________
L/SS, A, PW, Kills TW in h.d.
_____________
L/SS, A, PW, kills TW in h.d. |
Ineffective against bots.
__________________
Ineffective against bots. allows reinfestation between dewormings.
____________________________
Ineffective against bots. Allows reinfestation between deworming.
Doesn't kill migrating larvae.
________________
Same as above |
*Supposed to be rotated
with Rotectin 2
NOTE: Quest dewormer has been reported to have caused sickness and
death in some horses
KEY:
D.P.C=Decreases
Pasture Contamination
h.d.= high doses
En=encrysted
TW=Tapeworms
THW=Threadworms
LW=Lungworms
HW=Hairworms
DH=Draschia Habronema |
Lrv=Larva
L/SS= Large & Small Strongyles
LS=Large Strongyles
S=Strongyles
SS=Small Strongyles
A=Ascarids
PW=Pinworms
B=Bots
SW=Stomach Worms |
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