Wednesday, March 18, 2009

My horse's worming schedule

I just wormed Panama yesterday, and lo and behold, there's a blog post about worming schedules on another horse blog I read! So here's my worming schedule. It's rather different than what most people do, but my vet explained it when he recommended it to me last spring, and it makes good sense to me.

Basically, I worm every two months throughout the warmer months — mid-March, mid-May, mid-July, and mid-September. All four of these are with the same wormer, which rotates every year, and May is a double dose. Last year I gave Panama Anthelcide, this year is Strongid, next year will be Panacur, and the year after will be Quest. Then I start over in 2012 with Anthelcide.

During the winter months, in mid-December, I worm with Ivermectin.

The primary reason for switching wormers is so that the worms do not become resistant to certain wormers when used over and over again. My vet says that this worming schedule will give my horse four years between each wormer, which is A LOT of generations of worms — plenty of time to lose any resistance to the wormers they might have acquired.

As for Ivermectin, my vet says that it doesn't kill very much — whether because it's been overused or because there are just better options now, I don't know. He says the one thing it is really GOOD at killing is bots, which lay their eggs on horses' legs in the fall. So in mid-December, once all the buggies have been killed by frost and there isn't a chance of more eggs being laid, Ivermectin is given to get rid of the bots.

That's my worming schedule. What's yours, and how did you come to it? Vet advice, cowboy/cowgirl wisdom, or some other way?



At September 5, 2009 at 3:48 PM, Anonymous Equine Pharmacy said...

I would use Quest every 6 months then Pramox in between. Four wormers a year. There should be no need to rotate. Ben

At September 6, 2009 at 11:47 AM, Blogger Katharine Swan said...

Thanks, Ben, but I like the worming schedule I'm on. Why do you say there shouldn't be any need to rotate? The vets I've talked to all say that the parasites can become resistant to the wormer if you use it too much. Your worming schedule, which switches off between only two wormers, seems like it would be pretty likely to cause resistance. Also, what do you do about parasites being more active in the summer than the winter?


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