Natural Farming

Natural Farming

Soil - our connector!

Soil - our connector!

Monday, May 19, 2014

Tips for Drench Resistance - Worm Management


By on 3:54 PM

Worm management

The 4 key principles of worm management everywhere:
1. Do regular worm egg counts
2. Know your drench resistance status
3. Maximise non-chemical worm management
4. Seek professional advice

What Causes Drench Resistance?
  • Drench resistance is caused by exposing worms to several treatments of same drug
  • This can kill susceptible worms but leaves increasing numbers of resistant worms
  • The resistant worms are genetically different to susceptible worms
  • Resistant worms pass on their resistance to future worm generations
  • The practice of drenching sheep onto clean pastures with drenches that are not 100% effective leads to the rapid development of resistant worm populations.
How Quickly Can Drench Resistance Develop?
The rate of development of drench resistance is influenced by factors including:
  • The chemical group and persistency of the product involved
  • The frequency of treatments
  • The timing of treatments
  • The worm species involved
  • Environmental factors
 ·         The earlier you detect resistance, the EASIER IT IS TO MANAGE

·         UNNECESSARY DRENCHING is the major cause of drench resistance

There are several effective non-chemical ways to control worms.





Some management tools are:

  • Cross-Grazing with Cattle;
  • Buying Rams from studs that breed sheep resistant to worms;
  • Using “Smart Grazing”;
  • Managing Nutrition to help sheep develop resistance to worms.

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