Wednesday, 02 June 2021 17:55

Quarantine drenching critical - expert

Written by  Staff Reporters
Farmers bringing stock on to farm are urged to have a quarantine drenching regime in place to further prevent the spread of triple drench resistance. Farmers bringing stock on to farm are urged to have a quarantine drenching regime in place to further prevent the spread of triple drench resistance.

Farmers importing stock onto their farm are being urged to have a quarantine drenching regime in place to further prevent the spread of triple drench resistance.

AgResearch scientist Dr Dave Leathwick says there has been a dramatic upsurge in the number of farms with drench resistance in the past 18-14 months, often involving several different worm species. Leathwick says, as a consequence, an increasing number of farmers are buying problems on a truck.

“There are so many resistant worms out there that farmers are now much more likely to import them onto their farms with brought-in stock.”

He says this does not just apply to those trading lambs, as several documented cases have involved farmers grazing hoggets off the farm and bringing triple drench resistance home when they return.

Leathwick believes it is more important than ever to have effective quarantine treatments or procedures in place. He says this is due to the prevalence and severity of resistance being seen around the country.

Leathwick advises that there are only two drench products which should be considered for the purpose. Those are the drenches that contain one of the newer action families – monepantel or derquantel.

“As there are only two products which meet this criterion, this choice is pretty easy.”

He says in the past, the use of combinations of the older drench families would have been recommended as quarantine drenches, but this is no longer acceptable.

As well as a quarantine drench, imported animals should be held off pasture for at least 24 hours. Where this is not feasible (e.g., unit loads of sheep or cattle) it is recommended that treated stock be held on wormy pastures for 24 hours. They should be followed by adult animals to mop up any surviving worms.

Leathwick also encourages the use of a ‘knock-out’ lamb drench in late summer or early autumn to slow or stop any build-up of resistant worms surviving the routine drenches given earlier in the season.

“In terms of what drenches are suitable for this purpose, the same rules apply, that is products containing the newer action families.” he explains. “There is so much resistance around today that it’s just not worth the risk of using something else.”

Leathwick says the escalation of triple resistance is causing issues for sheep farmers all around the country. It can profoundly affect farmers’ ability to control parasites and continue to farm as they have in the past.

“Those that don’t have it yet need to be extra vigilant to make sure they don’t get it.”

More like this

Big win for scientist

AgResearch senior scientist Sue McCoard has been named 2022 winner of the prestigious McMeekan Memorial Award from the New Zealand Society of Animal Production.

National

What now?

Aged 64, Malcolm Bailey says farewell after a stellar career in the dairy industry but his knowledge, innovation and drive…

DCANZ chief bows out

Malcolm Bailey says one of the difficult things he's had to overcome in his tenure with DCANZ is getting traction…

Machinery & Products

Amazone's one-pass operation

Ag machinery maker Amazone has paired up its Precea precision air seeder and Combi-Disc 3000 compact disc harrow to deliver…

New grassland products

Grassland specialist Pöttinger has released a new portfolio of products and innovations for the new mowing season.

» The RNG Weather Report

» Latest Print Issues Online

Milking It

Oat juice, not milk

OPINION: New Zealand's best loved brand Whittakers has launched its first 'plant-based' chocolate but it hasn't left a sweet taste…

Heat wave

OPINION: The heat wave that hit Europe last week has forced a rethink among UK dairy farmers who normally graze…

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter