Wormer! - Page 2

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

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    04-07-2009, 09:44 PM
I'm going to just give him Ivermectin because I'm pretty sure that is what was given to him last late march/early winter. My schedule is every 6-8 weeks (meaning I gave him the last one late january, now he's getting it early april). My barnowner worms his horses once a month! I think that's too much. Not sure!
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    04-07-2009, 09:49 PM
6 weeks isn't a whole lot diffreant then every month. Theres a great deal of reseach that shows frequant worming allows parisites to build up resitance to what your using
    04-08-2009, 09:37 AM
I thought that if you rotate it enough the worms can't build resistance? I don't use the same thing twice in a full year. This is what has been recommended by my vet.

How often do you worm then?
    04-08-2009, 03:51 PM
Even with rotational deworming being the "norm" for many many years now, parasites are still developing resistance to the dewormers. I would recommend that you go to www.thehorse.com and do a bit of reading (check for the most recent articles) on deworming and go ahead and listen to their webinar on strategic deworming.

A list of all their webinars is available here:
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    04-08-2009, 11:40 PM
I was told to worm every three months, and to never use the same one twice in a row, I'm assuming that's because some may work differently than others, or maybe to stop any worms from gaining resistance to a certain kind.
    04-09-2009, 11:20 AM
Deworming every 3 months may be sufficient or it may be woefully inadequate depending on your horse and his particular situation. It's really important that we stop just guessing at deworming and treating every horse and situation like it's the same because in doing so we increase the risk of heavy parasitism in our horses, heavy pasture contamination and faster developement of drug resistance. We need to assess each individual as an individual--some are in situations where the risk of reinfection is very low, some are in situations where the risk of reinfection is very high, some have a high natural resistance to parasites while others have very low natural resistance to parasites. So what is good for one horse may not be appropriate for another horse even in the same pasture.

With deworming every 3 months and rotating dewormers in an area where the weather conditions are right for parasites to survive, you have a 2 month window when there can be hundreds of thousands of parasite eggs shed each day into your pasture. If you are in a situation where your horse is stalled all the time and fed hay/grain and gets turned out in a small paddock that is picked daily, you may still be over-deworming. You may only need to deworm twice a year. And since you aren't doing fecal egg counts occasionally, you may be using drugs that aren't effective in your area--for example, there is very widespread resistance to fenbendazole among strongyles. So if you deworm with fenbendazole and there are resistant strongyles, you can have egg shedding for 12-14 weeks---that's alot of eggs!
    04-09-2009, 11:39 AM
Our vet just did a free clinic on de-worming. He said the best thing to do is a stool sample. They are only $15.00 with our vet. Apparently you get a lot of information about what worms your horse has but also how resistant to worm infestation your horse is and then you can set up an appropriate program for your individual horse. I am going to do that next week for our horses. Can let you know if it seemed worth it.
    04-09-2009, 12:26 PM
Ask him if he is doing a fecal or a fecal egg count. There is an important difference. ;)

And a really good idea would be to run a fecal egg count and then dose with fenbendazole and run another fecal egg count 10-14 days later. That would help you determine if you have a problem with fenbendazole resistant strongyles so you know if that product should still be used in your horses or not
    04-09-2009, 12:38 PM
I will indeed ask that, thank you.
    04-15-2009, 02:24 PM
Just got the results. It was a fecal egg count by the way. And the price was $12.00 and $9.00 for the second horse. Not bad. They said our horses did not have anything and to repeat the test again in a month. So I guess that is really good news. I have not de-wormed since the beginning of January. Ryle, I was wondering if I could ask you a few questions? Is it true that the horses could still have worms but they are not giving off eggs at the moment? Does this basically mean that they do still have parasites but a very low infestation? The vet also said I could just de-worm in a month because the snow is clearing and they will be eating off the ground now and probably getting worms. I was very happy with the results because our horses have gone quite a few different places and been put in pastures with different boarder horses. Plus I do not really know the history of my new horse.

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