Wormers - Page 2 - The Horse Forum

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post #11 of 15 Old 02-28-2014, 12:40 PM
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Originally Posted by usandpets View Post
We just went to a seminar on deworming. It is now recommended to NOT do a regular schedule deforming and not to rotate dewormers.

You should have fecal counts done on each horse. The ones with higher counts would get dewormed but not the lower ones.

Regular dosing and alternating causes a resistance by the worms to dewormer. Leaving the lower count horse untreated lessens the resistance.
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Just to clarify- was the seminar recommending "don't deworm every 8 weeks, rotating the class of dewormer each time" or were they recommending "don't deworm every 8 weeks, but when you do deworm always use the same class of drug"?

I agree that giving dewormer every 8 weeks regardless of worm load is unnecessary and in some cases harmful. But my understanding of the latest recommendations was that rotating (to some degree) is recommended. Ideally the FEC would give you an idea of what worms your horse is carrying, and you'd choose a product based on that.

Hairworms, stomach worms, gastric bots, etc. will only be killed by ivermectin/moxidectin, so clearly you wouldn't want to rotate to pyrantel or fenbendazole based dewormers if that's what your horse had.

OTOH, strongyles, roundworms, and pinworms will be killed off with any class of wormer (assuming they're not resistant), so there shouldn't be any harm in picking a non-ivermectin dewormer, and if I understand correctly, dosing them with a different class of drug helps to prevent resistance.

Another thing that tends to get overlooked is that there are very few products (ivermectin/moxidectin with praziquantel: Equimax, Zimectrin Gold, Quest Plus) that kill tapeworms, and tapeworms very rarely show up in FECs. You should use a product that kills tapeworms at least once a year.
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post #12 of 15 Old 02-28-2014, 01:06 PM
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I don't worm my horse. The vet comes out twice a year and does a fecal (looks at her poop under a microscope, looking for worms.) She has never had them, so I don't worm her. I would IF she did... But I wouldn't pump your horse full of chemicals- natural or not- for no good reason. Have a fecal done, you might not need to worm your horse at all. If you do, the vet will tell you what kind of parasite you have and will tell you what kind of wormer to use.

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post #13 of 15 Old 02-28-2014, 01:13 PM
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you could accidentally mix up a mess and poison your horse.
I would not feed my horse potatoes until I did some research on that.
If you keep the manure picked out of pens, deworm before placing horses on pasture, then you should be pretty clean of parasites, The only problem I could see is if you got bots , I have not seen any bot eggs on my horses for a number of years.
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post #14 of 15 Old 02-28-2014, 05:55 PM
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Originally Posted by verona1016 View Post
Just to clarify- was the seminar recommending "don't deworm every 8 weeks, rotating the class of dewormer each time" or were they recommending "don't deworm every 8 weeks, but when you do deworm always use the same class of drug"?

I agree that giving dewormer every 8 weeks regardless of worm load is unnecessary and in some cases harmful. But my understanding of the latest recommendations was that rotating (to some degree) is recommended. Ideally the FEC would give you an idea of what worms your horse is carrying, and you'd choose a product based on that.

Hairworms, stomach worms, gastric bots, etc. will only be killed by ivermectin/moxidectin, so clearly you wouldn't want to rotate to pyrantel or fenbendazole based dewormers if that's what your horse had.

OTOH, strongyles, roundworms, and pinworms will be killed off with any class of wormer (assuming they're not resistant), so there shouldn't be any harm in picking a non-ivermectin dewormer, and if I understand correctly, dosing them with a different class of drug helps to prevent resistance.

Another thing that tends to get overlooked is that there are very few products (ivermectin/moxidectin with praziquantel: Equimax, Zimectrin Gold, Quest Plus) that kill tapeworms, and tapeworms very rarely show up in FECs. You should use a product that kills tapeworms at least once a year.
The best option is to do a FEC on each horse and use the dewormer as needed. Then 21 days later to do another FEC. Then twice a year to do another FEC and deworm with the one needed.

Rotating does cover more but unnecessary deworming causes a resistance to the dewormers.

For large operations having hundreds head of horses, I don't see it as feasible but then I don't think that they would deworm every horse on a regular basis either.

Actually, Zimectrin gold does target tape worms. That was the one they recommend to start with if you don't do the FEC.
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post #15 of 15 Old 02-28-2014, 06:17 PM
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Originally Posted by usandpets View Post
The best option is to do a FEC on each horse and use the dewormer as needed. Then 21 days later to do another FEC. Then twice a year to do another FEC and deworm with the one needed.

Rotating does cover more but unnecessary deworming causes a resistance to the dewormers.

For large operations having hundreds head of horses, I don't see it as feasible but then I don't think that they would deworm every horse on a regular basis either.

Actually, Zimectrin gold does target tape worms. That was the one they recommend to start with if you don't do the FEC.
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Ok, sounds like we're saying more or less the same thing
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