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Quick quiz: August 2015

The quiz questions are taken from:

The online learning pages focus on the important topics within worms, flies and lice and offer two approaches to learning: structured reading and question and answer.

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Answers and links to further information are provided below the image.

Questions

1. Are daggy sheep less resistant to worms?

2. What are advantages and disadvantages of spray-on products to prevent flystrike?

3. How long does it take for signs of lice infestation to become obvious?


Answers

1. Are daggy sheep less resistant to worms?

Dag resulting from scour worms is not an indicator that the sheep are more or less resistant to worms. It results from a hypersensitivity response in sheep that have previously developed immunity, and who are subject to a larger larval challenge after a period of little challenge (as can occur after the autumn break following a dry summer).

There is no relationship between sheep who suffer from hypersensitivity scours and those with higher resistance to worms.

Nevertheless, it is useful to select against dag using DAG ASBV, as dag is an important factor predisposing sheep to flystrike.

2. What are advantages and disadvantages of spray-on products to prevent flystrike?

Technique

Advantages

Disadvantages

Spray-on

  • Can be used for long wool flystrike prevention
  • Ease of application—can be applied with a power-asisted applicator, which helps ensure consistency and reduces operator fatigue
  • Products ready for direct application so no additional water required
  • Disposal of empty containers only
  • Cost
  • Applicator must be matched to product

 

3. How long does it take for signs of lice infestation to become obvious?

It takes at least 3 months from the time of initial infestation for rubbing to become obvious. But it could be 6 months if the initial infestations was very small (such as just one stray sheep, itself with a low number of lice).