Deworming Schedule? - Page 2 - The Horse Forum
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post #11 of 13 Old 03-15-2010, 07:34 PM
Join Date: Jul 2007
Location: East Texas
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It is not a "thought" that parasites are becoming resistant to the commonly used drugs. There is more than 15 years of research showing growing resistance. Strongyles are resistant to fenbendazole in more than 90% of the areas tested in the US and to pyrantel in about 50% of areas tested. Ascarids have been showing resistance to ivermectin and pyrantel for the last 5 years in certain areas and it's growing.

Please take the time to go to the horse magazine's website and watch the 1 hr presentation on Strategic Deworming that was aired in June of 2009. The newest recommendations on deworming made by experts in equine parasitology were presented: The Horse | Videos: Webinars

I deworm in the spring and fall with an ivermectin/praziquantel or moxidectin/praziquantel and then 0-2 times more during the winter months (that's when our highest reinfection rates are seen) based upon Fecal Egg Counts that I ran to see which of my horses were high, medium or low egg shedders.

Cindy D.
Licensed Veterinary Technician
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post #12 of 13 Old 03-15-2010, 09:12 PM Thread Starter
Green Broke
Join Date: Nov 2008
Location: Copley, OH
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Thanks everyone! My vet has recommended the same some of you have -- fecal egg count to determine it, and then only deworming when it's absolutely necessary. She was actually going to give a seminar at my barn about it but no one signed up...strange, you'd think people would WANT to save $$ and worm less!

"The times when you have seen only one set of footprints in the sand, is when I carried you..."
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post #13 of 13 Old 03-16-2010, 12:17 AM
Join Date: Nov 2009
Location: Canada
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Originally Posted by Hoofprints in the Sand View Post
Ok now there seem to be a couple different schools of thought here, so I thought I would get some opinions.

School#1 (old school): Deworm about every 2 months (6-8 weeks), rotate through the different types

School#2 (new school): Deworm only about 2-3 times per year, no dewormer needed from Oct-Feb (in the northern states anyway where we get the deep freezes)

The thought behind this new school of thought is that worms are becoming VERY resistant to what we currnently have and deworming as often as we are doing is making it worse.

How often do YOU deworm your horse?
I guess I was/am ahead of the times!
Im what I consider old school in the sense, that I have had horses for 30 plus years.......
and NEVER dewormed every 2 months...thought it was over kill. I did/do rotate my dewormers based on what coverage I need/ed for the particular time of year. And always do early spring, summer, and late fall.
I may throw an extra dewomring in their if I think its warranted/

Glad to see my common sense has theory backing it now

Horses are like can never just have one
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