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Questions

1. True or false? Rotating drenches (using a different drench group each time) will prevent drench resistance.

2. What 3 factors affect the risk of breech strike?

3. When using a dip to treat sheep for lice, what is reinforcement?


Fleece rot is the number one factor in susceptibility to body strike, but what  are the factors for breech strike?
Fleece rot is the number one factor in susceptibility to body strike, but what are the factors for breech strike?

Answers

1. True or false? Rotating drenches (using a different drench group each time) will prevent drench resistance.

False. Rotating drenches is a common strategy, but has only a minor effect on slowing the development of drench resistance, even when combined with paddock rotations.

However, using the following three strategies together has a large impact, and will greatly slow the development of drench resistance:

  1. Use drenches most effective on your property. 
  2. Use an effective combination of two or more drench groups, either in a multi-active product or using more than one product concurrently (up the race with one and then the other) to combine different drench groups. The higher the efficacy of each drench group, the greater the benefit for slowing drench resistance. 
  3. Use short-acting treatments and restrict the use of persistent products for specific purposes and high worm-risk times of year. 

2. What 3 factors affect the risk of breech strike?

There are three major factors contributing to the risk of breech strike.

  1. Wrinkle in the breech – increasing the risk of urine and faecal staining as well as providing a moist environment for breech strike.
  2. Faeces in the breech wool – providing a moist, smelly environment for strike and food for blowflies.
  3. Urine in the breech wool – providing a moist, smelly environment for strike.

3. When using a dip to treat sheep for lice, what is reinforcement?

Reinforcement replaces the insecticide removed from the dip wash by stripping. It involves the regular addition of insecticide product, but not water, to the dip.