Triple drench resistance is on the rise

Another faecal egg count reduction test (FECRT) season has come to a close and we have had some concerning results, showing continued high levels of resistance to triple combination drenches and growing resistance to dual-actives. 

We performed a total of 10 reduction tests in 2024. Above is a graph showing the results (please note, not all farms tested for every drench). *It is also important to note that this is a small sample size and likely not fully representative of our area, but the results still give some very important insight.  

Resistance to the dual combination drench products has spiked from 18% across both products last season to 33% and 22% this year. Meanwhile, 22% of the 9 farms that tested a triple drench are resistant, which is again higher than last season’s results. Even more alarmingly, one out of four of the farms testing a novel drench also showed resistance. 

Triple drench resistance is not a death sentence, but likely will involve some management practice changes. The farms above are working closely with their KeyVets to ensure we can get the best out of the situation. 

These results are a timely reminder of how important non-drench parasite management practices are and how important it is to continue monitoring drench performance on your property.  

Please don’t hesitate to contact us if you have any questions. 


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