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This is a discussion on Dewormer? within the Horse Health forums, part of the Keeping and Caring for Horses category

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    • 1 Post By jaydee

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        08-30-2013, 01:45 PM

    I just got my first horse and I don't know what kind of dewormer to use. I know that I need one that will kill bots but I am at a loss for what brands and kinds. Any advice would be greatly appreciated!
    My mare is an 11 year old Arab.
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        08-30-2013, 01:48 PM
    Well, de-wormers go on a rotational basis. If you use the same kind over and over again, they will not work.

    Here is a link to the kind which correlates to the months for its use:

    Deworming Rotation Schedule and Worm Facts

    If you look on the package, it will tell you what kind of paste it is(pyrantel, ivermectin etc etc)

    Is it August, but because it's almost the end, coming up on September, I would use benzimidazole.
        08-30-2013, 03:33 PM
    Super Moderator
    The majority of vets now favour fecal counts and targeting worms based on the results rather than even using the rotational system.
    If you've just bought the horse then that's what I would suggest you do.
    Depending on how the horse is managed it can be possible to just worm twice a year for tapeworm, bots and the possibility of there being encysted worms - these don't normally show up in fecal tests
    xlionesss likes this.
        08-30-2013, 03:48 PM
    Jaydee, very good point. I've heard of vets doing this now, but haven't seen/heard of it done personally...definitely something to strongly consider.

    I feel that if you do the fecal, you can pin-point what EXACTLY is needed.
        08-30-2013, 03:49 PM
    Green Broke
    Seconding what jaydee said. I deworm twice a year, with a FEC done in between to see if any additional is needed. So far, they've all come up clean.

    As for what kills bots- only the ivermectin-based products will do that.
        08-31-2013, 01:33 AM
    The problem with the fecals is that certain worms at certain times in their life cycles will not be detected. At least that's what a vet told me when I requested one. It was like she was trying to talk me out of it *shrugs*
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        08-31-2013, 05:08 AM
    Everyone I know with multiple horses still relies on rotational worming, including us.
        08-31-2013, 10:48 AM
    Super Moderator
    One of the biggest deciders in fecal count worming is how you keep your horses - if they are in what my vets calls -isolated conditions - then it works really well. That is horses kept on property that doesn't adjoin other horse properties and the horse population is static - no constant influx of new horses or all new horses are kept in quarantine conditions until they have been fully wormed.
    Many worms are now showing to be resistant to the active ingredients due to over use and there are currently no new ones coming on the market so in a lot of cases people are throwing money away at something that's not effective or not needed because the horse isn't carrying those worms to start with
        08-31-2013, 11:38 AM
    I have a friend that works at Cleveland Equine Clinic. He told me of a bequtiful 2 year old TB that came in with neurological disorders. Poor thing could hardly stand and kept falling over. Come to find out it was due to the owner deworming with ivermectine for cows because he wanted to save $5. Luckily the horse made a full recovery after almost dieing.
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