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Latest and greatest on deworming: resistance thresholds, using refugia against the worms, and more

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  • Latest and greatest on deworming: resistance thresholds, using refugia against the worms, and more

    https://aaep.org/sites/default/files...a32RSkjCKVGkBo

    So. Many. Good. Takeaways!

    It's a long read but it's REALLY good, I promise.
    ______________________________
    The CoTH CYA - please consult w/your veterinarian under any and all circumstances. - ET

  • #2
    Very informative article JB, thank you for posting!

    Comment


    • #3
      Thank you this is excellent & very helpful!
      Life doesn't have perfect footing.

      Bloggily entertain yourself with our adventures (and disasters):
      We Are Flying Solo

      Comment


      • #4
        It's so hard to just medicate the heavy shedders. I started doing our farm fecals 1.5 years ago. When I ran across a sample <100 epg (McMasters) that would indicate low shedding, I'd start monitoring monthly. In most cases, after a couple months of no treatment, the low shedder would become a high shedder presumably as the parasite load increased.

        Comment

        • Original Poster

          #5
          I would question what's going on if "in most cases" you're seeing low shedders become high shedders. Historically, through 1000s and 1000s of horses studied by the researchers above, that doesn't happen. Low shedders typically remain low shedders, high shedders typically remain high shedders.

          Sometimes the boundaries cross - an historically low shedder might suddenly have a high count if the conditions are just right (and you might not really know what those conditions are). One of my historically low/zero count horses suddenly had a 1500ct one Summer several years ago. He was treated, had 2 FECs a year for a couple years after that, and was never high again.

          As they get older, their immune system might allow shedding status to increase. Same with young horses being treated as high shedders while their immune system ramps up.

          But it is not at all normal or typical for low shedders to move in to high status unless they become overwhelmed with parasites - poor pasture management, illness, other stresses.
          ______________________________
          The CoTH CYA - please consult w/your veterinarian under any and all circumstances. - ET

          Comment


          • #6
            Thanks for sharing this, JB! Very interesting.

            Makes me even more disappointed in the boarding barns I know that still do mandatory rotational deworming for all horses with the same product on the same day every 8 weeks.

            And it will be interesting to talk with my vet about what this means for parasite management in an individual horse (no coordination across boarders)/dry lot individual turnout/semi-arid climate situation, with a history of low or zero FECs and no clinical signs of parasitic disease. Might make sense to drop down to a single, well-timed annual anthelmintic treatment under those conditions barring any unusual FEC results.

            Comment


            • #7
              I had one low shedder and one moderate/high shedder swap status at one point. The vet tech even asked me if I could have mislabeled the samples (no chance).


              Now I know where the rotation every two months process came from! And why it is no longer useful!

              Comment


              • #8
                Originally posted by x-halt-salute View Post
                Thanks for sharing this, JB! Very interesting.

                Makes me even more disappointed in the boarding barns I know that still do mandatory rotational deworming for all horses with the same product on the same day every 8 weeks.

                And it will be interesting to talk with my vet about what this means for parasite management in an individual horse (no coordination across boarders)/dry lot individual turnout/semi-arid climate situation, with a history of low or zero FECs and no clinical signs of parasitic disease. Might make sense to drop down to a single, well-timed annual anthelmintic treatment under those conditions barring any unusual FEC results.
                True enough, but from a stable (vice individual horse) management perspective the "industrial" approach is the most cost efficient and cost efficiency is a very highly valued number in boarding barns. So there's going to have to be some compromise between the owner's expectations and what the barn management can practically do. This suggests a conversation, hopefully in a polite tone, to consider alternatives. And the horse owner has to be ready to pay for any extra attention to their horse's needs.

                G.
                Mangalarga Marchador: Uma Raa, Uma Paixo

                Comment


                • #9
                  Not sure what you're getting at, Guilherme . There is no interest at my current barn (semi-arid climate, no shared grazing, horses managed individually except in exceptional circumstances like quarantines) in taking any sort of "industrial" approach, and given the relatively poor conditions for parasite transmission I think that's fine.

                  Rotational deworming is out of date, even in those barns that do take an industrial approach, and the relationship with refugia and resistance noted in the linked document suggests that the all horses/same product/same day frequent anthelmintic treatment approach may create/exacerbate local resistance (ultimately making it not cost-efficient). Thankfully, that's not my problem!

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