Episode 8 – The ticking time bomb of drench resistance

In Podcasts3 Minutes

A recent national report showed that a third of sheep farmers have triple drench resistance – what does that mean for you?

Well, imagine finding out you’re leaving $100,000 on the table every year due to having 20% lower growth rate on your lambs by not addressing drench resistance?

Wherever you are on the drench spectrum, taking control and making management changes by knowing your parasites can reap financial rewards.

Guests include:

  1. Sara Sutherland, Vet at The Vet Clinic, Wairarapa
  2. Clive Bingham, Livestock Veterinary Technical Advisor, Zoetis NZ
  3. Ginny Dodunski, Wormwise Programme Manager


  1. Rebecca Greaves, Editor, Country-Wide
  2. Sarah Perriam-Lampp, Managing Director, CountryWide Media

The episode kicks off with veterinarian Sara Sutherland’s explanation of the financial impact of having drench resistance if you have it and don’t do anything about it and the potential of lamb growth if you make farm management changes in response to drench resistance. Sara shares the results of a modelling exercise she has done recently with a farm consultant on Farmax to showcase the financial benefits different farm system changes sheep farmers have made.

Read Sara Sutherlands article “A Change of System” (Country-Wide Autumn 2024)

Clive Bingham from Zoetis NZ stresses that drench management plans are the way to avoid drench resistance and the tools from genetics, nutrition and farm system changes you can make.

To wrap the episode, Sarah Perriam-Lampp shares a snippet of a discussion with Wormwise’s Ginny Dodunski from the Beef + Lamb NZ Parasite Chronicles Podcast.

Read Ginny Dodunski latest column “What to do with tail end ewes” (Country-Wide Autumn 2024) 

Listen to farmers who have made changes to reduce drench use on Beef + Lamb NZ’s Parasite Chronicles Podcast hosted by Sarah Perriam-Lampp: 

Ep 1 – Tom Brown

Ep 2 – Andrew Law

Ep 4 – David McKenzie

Subscribe to Country-Wide magazine for $59 for four issues annually: https://country-wide.co.nz/shop/ 


A word from our sponsor

When it comes to impacts on growth rates for stock over summer and autumn, parasitism is second only to nutrition as the most common reason for ill-thrift in young sheep.

Zoetis NZ want to ensure that you have effective parasite management on your farm is therefore crucial to maximise production and reduce the chances of developing drench resistance.

It is therefore important to consider the following factors:

Learn more about parasite management here