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Vol 21 No 48, December 11, 2023
Drench time bomb blows Richard Rennie
NEWS
T
Livestock
RIPLE drench resistance in cattle, once considered only a distant threat, is now a clear and present danger to the New Zealand beef and dairy industries, and only likely to get worse. A research paper by AgResearch senior parasitologist Dr Dave Leathwick and colleagues has identified triple resistance to drenches in cattle on four farms studied. The detection of resistance to the three main anthelmintic types comes 16 years after widespread double resistance left only the levamisole active as the last drug standing in countering Cooperia parasites in cattle. It also comes as growing drench resistance in sheep is costing that sector over $100 million a year in lost earnings. “It is quite scary because we did not really go looking for these parasites, this simply dropped into our laps,” Leathwick said.
The study on four farms identified, from drench testing, that in only three of 20 tests taken did drench efficacy exceed 90%. On its own the previously effective levamisole active recorded efficacy of only 44%-70% against Cooperia, far below the 95% required. “Every case we got involved in was because the farmer saw clinical signs, he went to the vet and got a drench test and then came to us,” Leathwick said. One farmer had already grappled with widespread drench resistance in his sheep flock. Cattle performing poorly for no apparent reason had been the prompt for farmers to suspect there was a drench problem. “One vet in the South Island was investigating 1000 dairy heifers that would not grow, were scouring and looked awful.” Despite being a clinical scientific paper, the document does not hide the authors’ frustration after 20 years of trying to alert farmers to the inherent risks of relying Continued page 3
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The cradle of a region’s industry This woolshed at Brancepeth, built in 1859, is thought to be the oldest woolshed still standing in Wairarapa, according to research by conservation architect Chris Cochran. It was built using pit-sawn timber framing and roofed with split totara shingles. Today it is used for storage. Cochran is producing a book, Woolsheds of the Wairarapa – An architect’s appreciation of a New Zealand vernacular. Photo: Jim Simmons, courtesy of Ed Beetham
NEWS 4
Dairy helps to rebuild war-torn Sri Lanka Selina Prem Kumar, pictured with Mid Canterbury farmers Fred and Sandy Hoekstra, is the driving force behind Tearfund NZ’s farming and enterprise project supporting Sri Lankan dairy farmers.
PEOPLE 12 Gisborne’s mayor frustrated with the changes around Three Waters management.
The Chinese economy could be about to come alive again, says a new report.
Teaching agriculture to city kids earns Auckland teacher national recognition.
POLITICS 4
MARKETS 5
PEOPLE 22
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