Resistant to wormers

We have proved ivermectin resistance in our now yearling.
It depends on worm that is causing the problem, we are still having problems with ascarids (sp?) and pin worms and had to look at the whole management process which has included having sheep cross grazing. We are working closely with our vet (who has involved rossdales and liphook) and it seems that out of the 6 horses we have only 3, which interestingly are related that have the issue, also where resistance usually occurs in older horses strangely its the older ( 24 &30 yr olds) that aren't affected.

Btw we poo pick every day, each horse has its own grooming kit, no shared rugs, buckets not stacked and washed between use. Stables are regularly cleaned out and disinfected.

Not sure if this helps?
 
Thanks - really helpful. We have sent his dung to be analysed to see what we are dealing with. I have only had him (ex racer) since October, and he wasn't in great shape when we got him. I am really hoping he hasn't permanent worm damage, as I suspect he went at least 18 months without being wormed. All the others are fine.
 
I hope you don't have worm damage, we lost izzy to re-occurant colic and it was possibly linked to worm damage and wormer, she left us with a3 month old orphan foal who we also had wormer resistance and colic at 6months old (we eventually lost her too but it's a very long story)

As I said worm type does seem to make a difference as different wormer can do different things.

Would be interested to hear how you get on?
 
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