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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, 11:53 AM

My guy gets dewormed every six months, and I know my schedule says to do it in the beginning of April, but I just cannot find my schedule anywhere! I forget which to do for spring. What do you guys use?? In January he got I think either safe guard or zimectrin gold. Can't remember!
Laura and Drake the TB
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    04-07-2009, 01:27 PM
You should be worming at least every 2 mths, I alternate ivermectin and strongid, and do a equimax spring and fall
    04-07-2009, 01:39 PM
I do not worm every 2 months. Just spring and fall. My horses have never had a problem. Why do you suggest every 2 months?
    04-07-2009, 01:56 PM
I'm guessing the OP meant six weeks? Last I checked January-April is less than six months but more than six weeks.

Normally it's about two months tops for in between wormings. You deworm that frequently as the insecticides in the wormer expell/kill the current worms but horses are constantly exposed to them so they need frequent wormings to keep the counts down. By doing it only twice a year you are allowing a large, large build up of worms and ickyness. Plus you probably wouldn't be able to kill off that many worms with a normal dose and would need some kind of power-pack. Not to mention you are allowing the worms to grow and possibly migrate into other areas (respritory etc). KTspeedhorse I would seriously re-evaluate your worming program, unless of course you are some bi-yearly plan through your vet etc. but if you're deworming twice a year with normal paste wormers... yikes. I'd be worried about colic, the worms spreading etc.
    04-07-2009, 02:12 PM
Humm. Thanks One : ) I never have dewormed more than 2x per year. We do live in a cold climate and this may be why we have never had a problem. I will discuss this with my vet. Maybe he will laugh at me thinking I should have been on the every 6-8 week schedule this whole time over 19 years LOL. Thanks again.
    04-07-2009, 02:47 PM
Oh you still need it in a cold weather climate, I'm from MN and try to stick as close to 6-8 weeks as I can. Good luck!
    04-07-2009, 02:48 PM
We worm 4x per year...I'll post up the rotational schedule my prof gave us last semester...we had like 4 classes on worms
    04-07-2009, 03:03 PM
How often one worms and with what depends on where you live, how you house your horse, horses age, and if you rotate pastures or lock them up in one. I worm my adult horses twice a year both times with liquid Ivermictin.
    04-07-2009, 09:18 PM
Yep, how often and when to deworm very much depends on a bunch of factors including housing/pasture situation, age, geographic location, etc. Deworming every 6 weeks isn't a good program because you are deworming again at the wrong time after the last drugs used. You are either allowing egg shedding to continue for a couple of weeks before the next deworming or deworming too soon when there is nothing for at least 1/2 of the common deworming drugs to treat. Strategic deworming should be practiced so that you only deworm when necessary to treat the parasites you are dealing with. Some horses can get by with deworming only twice a year---others may need a more stringent deworming program but again every 6 weeks isn't appropriate for any of the drugs on the market.

And in PA there isn't any reason to deworm in the middle of winter. In the northern US the reinfection rates in winter are at their lowest. Deworming should be done after the cold weather begins and then not be done again until spring. In spring, all horses should get ivermectin or moxidectin (generally along with praziquantel) to treat for bots (and tapeworms) to help break the life cycle and keep from recontaminating the horse's environment with these parasites.
    04-07-2009, 09:39 PM
My bad! I meant 6 weeks. :O

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