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Worm Resistance and Reduction

Worm resistance is a phrase commonly used when discussing worming programs but what does it mean? 

The benzimidazole chemical has been used for many years by horse owners regularly every six to eight weeks.  Some species of worm have created a resistance to this chemical and it is now ineffective on these worms.

There is no reversing the situation which is why it is very important to test for resistance.  To order click here.

The resistance test involves taking a sample of dung for analysis before giving a benzimidazole wormer and a second sample ten days later.  If the result has not reduced by between 85% and 95% then the worms are benzimidazole resistant.

This is money well spend as it ensures the health of your horse.

There is no known resistance to any other chemical, in this country (some has been observed abroad)  but experts predict that if the moxidectin and ivermectin wormers are used continually year in year out then eventually the same thing will occur.  There are only three chemicals available in total anyway and increased resistance in worms could lead to none of the wormers working in time.

The practise of good chemical rotation will ensure that this does not happen.  If you are unsure about this then please go to our chemical worming section, or send an email to our consultants.

Worm Reduction

Many horse owners mistakenly believe that it is impossible to get rid of worms. 

This really is an old wives tale. 

With Intelligent Worming every month more and more worm egg count results confirm that horses are clear of worms.  Some of these horses have been monitored for four or five years and have not had a positive reading for over three years.

In ALL cases it is possible to reduce the worm burden to a minimum even if you can’t eliminate it completely.  It is estimated that only 20% of horses in the UK have worms.  Let’s find them and get rid of the parasite problem.