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2020 May

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. On average, during which few months of the year will there be the highest numbers of infective scour worm larvae on pasture?

2. Breech cover can be used as a selection tool for reducing flystrike susceptibility. However, which other traits are more important to use first?

3. What management can be done to limit the spread of dermo?

4. Aside from sheep, name 2 other farm livestock species that can carry goat worms?

The availability of infective larvae of the winter scour worms on pasture. Source: The epidemiology and control of gastrointestinal parasites of sheep in Australia. Edited by A.D. Donald, W.H Southcott and J.K. Dineen, Division of Animal Health, CSIRO 1978.
The availability of infective larvae of the winter scour worms on pasture. Source: The epidemiology and control of gastrointestinal parasites of sheep in Australia. Edited by A.D. Donald, W.H Southcott and J.K. Dineen, Division of Animal Health, CSIRO 1978.

Answers

1. On average, during which few months of the year will there be the highest numbers of infective scour worm larvae on pasture?

The availability of infective larvae of the winter scour worms on pasture, typically peaks around June–August (depending upon the timing of the autumn break).

2. Breech cover can be used as a selection tool for reducing flystrike susceptibility. However, which other traits are more important to use first?

The importance of a bare breech in breech strike was investigated and it was found that it was less important than dags, urine stain and skin wrinkles. However it does play an important part as it can exacerbate the effect of wrinkles and dags.

3. What management can be done to limit the spread of dermo?

An alternative approach to using zinc sulphate is to improve management around dipping to avoid dermo spread e.g. don’t hold wet sheep closely together in yards for extended periods, don’t truck wet sheep or choose not to wet-dip in years when the risks of dermo and subsequent losses are greatest.

When dermo risk is high:

  • Cull infected sheep if only a small proportion is affected
  • If affected sheep can be clean-shorn, choose a backline lice treatment. See Short Wool Tool.
  • Use good dipping management. See Plunge and cage dipping LiceBoss Note.
  • Consider adding a bacteriostat to the dip.

4. Aside from sheep, name 2 other farm livestock species that can carry goat worms?

Sheep and alpacas can carry goat worms. While young cattle/calves also carry some goat worms, adult cattle tend to have very low burdens of goat worms and contribute very little to contamination of pastures with worms affecting goats.

 

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