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
·
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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