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Prakash
Member
Username: Prakashb
Post Number: 7
Registered: 3-2006
| | Posted on Wednesday, Mar 29, 2006 - 7:32 am: |   |
Alright, I have a question. I'm currently trying to devise a schedule, my horse is on a somewhat infested pasture. I am going to get a fecal count done next week (when i go home and get my horses stool sample). And my horse has coliced 2 times while i've had her (for a year, and she is now 3 years old), so I put her on daily wormer. Here are my questions, any insight would be greatly appreciated.
1. My horse is on daily wormer, but I've heard you should rotate the daily wormer out, use for six months in the summer, and then don't use for the winter. Then start back again for 6 months. Does this have any truth behind it to avoid resistance build up?
2. If it does, during those six months I have her wormed with ivermectin once, and moxidectin the next. Is that pointless to do one and then the other because they are supposedly in the same class? Or would it be better to just use one or the other for two wormings in a row?
I'm in central florida, so my summer is actually 10 months also, so I would think that worms thrive better in the warm weather, so i'm not sure if I should keep her on daily wormer all of the time.
Here is my proposed schedule based on research on the web and this site:
Jan- pyrantel pamoate
mid Feb- quest gel (moxidectin and praziquantel)
(START DAILY WORMER)
April- Panacur powerpack (fenbendazole)
June- ivermectin
August- moxidectin
(End DAILY WORMER)
Oct-anthelcide (oxibendazole)
mid Nov- equimax (ivermectin and praziquantel)
So the months on daily wormer just protect against bots and she is wormed less often. The months that she would be off the daily wormer are the months she gets wormed every six weeks . ANY help or advice, or criticism would be greatly appreciated. THank you.
mid Nov |
Prakash
Member
Username: Prakashb
Post Number: 8
Registered: 3-2006
| | Posted on Wednesday, Mar 29, 2006 - 9:44 am: | |
Also, sorry to bother everyone yet again, but in the article when it says to withold the food before worming to make effective, does that include hay and grass? Or does food just include grain. Thanks! |
Robert N. Oglesby DVM
Moderator
Username: Dro
Post Number: 15195
Registered: 1-1997
| | Posted on Wednesday, Mar 29, 2006 - 10:32 am: | |
1) I don't know of any work that supports the idea of on six months and off six months prevents resistance to daily Strongid. I could see where in may delay the onset but probably not prevent it.
2) Now moot.
The specific schedules we give is considerably better than your schedule at killing parasites and preventing resistance. See the overview article for an explanation on why we do not recommend you use benzimadazoles and pyrantel pastes. And finally yes that would include grass and hay.
DrO |
Prakash
Member
Username: Prakashb
Post Number: 9
Registered: 3-2006
| | Posted on Wednesday, Mar 29, 2006 - 10:53 am: | |
What i don't understand, is how resistance can develop while on the strongid daily wormer, if it is used every day.
Now, if i withhold all food from my horse for 6 hours before and 2 after, do I have to worry about her colicking afterwards if she decides to binge on hay for a while?
Alright, so if i decide to leave my horse on daily wormer year round, should I rotate ivermectin and moxidectin during the individual year, or should I go one year while on strongid 2x and ivermectin, and then the next year on strongid 2x witht he moxidectin. (the ivermectin/moxidectin would just be to deal with the bots and I would use one with a praziquantel each year to ensure that tapeworms would be eliminated) |
Robert N. Oglesby DVM
Moderator
Username: Dro
Post Number: 15196
Registered: 1-1997
| | Posted on Wednesday, Mar 29, 2006 - 6:56 pm: | |
The issue with strongyle resistance and daily pyrantel (Strongid) is not a logical exercise but a frequently observed phenomenea. In Kentucky on farms where they have used daily pyrantel for more than 2 years resistance runs up to 73 percent of the strongyles. We don't know how this happens but it does. A likely scenerio is that the daily product is not 100% effective a few resistant individuals get through and reproduce and their offspring inherit the resistance, so this population of resistant organisms grows. This is not an odd phenomenea but also frequently observed with antibacterials, other anthelminics, and antivirals.
Unless they have an odd sensitivity they will be fine off food for 8 hours every 2 or 3 months.
You should not use pyrantel (Strongid) for year after year, it will loose efficacy. If you are in a situation where the pastures remain somewhat infested because there are horse not well dewormed on it, you should consider moving your horses because eventually it may adversely effect your horses no matter what you do. As the articles explains, it is the larvae and the migration they do following ingestion that do much of the important damage to your horse.
DrO |
