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

Drenching - doing it right

Effective and accurate drenching is important for animal health and productivity. It needs strategic decision making and should be part of a parasite management plan.

Changing look for NZ lamb?

New Zealand meat producers will have to change their breeding priorities to take a full advantage of a new optical meat quality monitoring system being developed by AgResearch.


OCD's record milk collection

The country's second largest dairy processor collected just short of 2 billion litres of milk from its suppliers.

Fieldays returns

After a hiatus of two years, National Fieldays opened to a grey foggy day in the Waikato, last Wednesday.

Machinery & Products

Classy new home for CLAAS

Visitors to last week's National Fieldays were able to check out the new home for CLAAS Harvest Centre, Waikato and…

Major deal for AgriQuip

New Plymouth-based AgriQuip has been appointed as the exclusive importer and distributor of the Major Equipment brand, with the aim…

» The RNG Weather Report

» Latest Print Issues Online

Milking It

Name it and milk it

OPINION: University researchers in the UK believe that a cow will produce more milk if you give it a name.

No thanks!

OPINION: Auckland yoghurt maker The Collective claims it is the first New Zealand dairy yoghurt brand to offer a plant-based…

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter