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Questions

1. Will worm larvae and eggs die during winter?

2. What are the two key signs that indicate that blowflies might be resistant to flystrike preventative chemicals on your property?

3. By which application methods can diazinon be applied as a lice treatment?

4. What causes wasting in goats?


Worm larvae can survive the winter, but worm eggs are not all as tough.
Worm larvae can survive the winter, but worm eggs are not all as tough.

Answers

1. Will worm larvae and eggs die during winter?

Worm larvae can survive through the winter despite cold, frosts and snow due to the protection from the pasture and soil. In fact, they die faster during warm weather than cold weather.

Worm eggs vary in the required “maximum daily temperature” they require for hatching:
Brown stomach worm >8°C, Black scour worm: T. colubriformis >15°C, T. vitrinus >12°C, Barber’s pole worm >18°C. If it is too cold, they will die within days to weeks.

Eggs will also need at least 10–15 mm rainfall to hatch and develop.

2. What are the two key signs that indicate that blowflies might be resistant to flystrike preventative chemicals on your property?

  • a shortening of the protection period (specified on product labels)
  • flystrike in multiple treated sheep rather than just a few.

3. By which application methods can diazinon be applied as a lice treatment?

Diazinon is an organophosphate (OP) that has caused serious illness in many users in the past. It is now only permitted for use in Richards-design submersible cage dips or as the spray-on product, Eureka Gold®

It is illegal to use diazinon in any other cage dip, plunge dips, shower dips, automatic jetting races, or hand jetting.

Note: only one company in Australia has a permit for cage-dip Diazinon use: Dipping Dynamics (owners and designers of the Richards-design cage dips). All other operators (and other application methods) should be using either the alternate OP, temephos, or a different chemical group altogether.

4. What causes wasting in goats?

Scour worms can cause weight loss, but not all goats that are losing weight, weak and lethargic are suffering from worms, or they may be suffering from worms as well as another disease condition.

Other conditions that can cause weight loss:

  • Johne’s Disease
  • Caprine Arthritis Encephalitis
  • Internal cheesy gland abscesses. However, about half of the goats that have cheesy gland have internal abscesses, and this is not a major cause of wasting
  • Copper deficiency
  • Cobalt deficiency
  • Undernutrition
  • Poor teeth