An around the world approach to fighting drench resistance
Beef + Lamb New Zealand is seeking global partnerships as it works to revolutionise internal parasite management in the face of increasingly widespread drench resistance.
An emerging drench resistance issue has been identified on Beef + Lamb New Zealand's Future Farm Lanercost in North Canterbury and a holistic plan is being put in place to protect future livestock productivity.
Lanercost's management team was alerted to a problem last spring when lamb weaning weights were below what would have expected in an otherwise outstanding season.
Consultant vet Ben Allott looked at a number of possible issues, but parasitism identified during a post-mortem was deemed to be the most likely cause of poor lamb performance.
"I don't think drench resistance is limiting production here, but poor drench selection decisions could have. But I suspect a wider systems issue is all leading to a parasite challenge problem."
Allott says Lanercost is on the precipice in that it does have multi-drug resistance Osertagia and if the system is set up so that thee is a continued reliance on drench or chemical input, then the situation will rapidly deteriorate.
"The onus is on us to implement farm management that will halt the progression of drench resistance and ultimately we would like to improve." Tests have shown some resistance to benzimidazoles (BZs) and levamisoles (LVs), but Dr Dave Leathwick from AgResearch believes this resistance is manageable with the appropriate management.
This is an early warning, and you need to pay attention to it."
Leathwick says the management team is fortunate to have the option of drenching as they have effective drenches available to them, which is not the case on a growing number of farms.
Lanercost is far from unusal in having a degree of drench resistance. Leathwick says there are very few farms in New Zealand that don't have resistance of some sort.
"There might be 10% of sheep farms that don't have any resistance, but that is possibly being generous and in cattle farms there are none. I am sure every cattle farm in NZ has Cooperia resistance."
The focus at Lanercost is to develop long-term sustainable policies that will enable them to maximise productivity and profitability in their sheep flock without relying on drenches.
The management team on Lanercost will soon be documenting their parasite management decisions on the Future Farm page of B+LMNZ's website. This will give farmers the opportunity to see what worked, what didn't, and lessons learnt.
Preventing Further Drench Resistance
The following management strategies are being implemented on Lanercost to halt more drench resistance:
For more information on parasite management go to www.wormwise.co.nz.
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