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Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep
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Primary screen for potential sheep scab control agents.

J A Dunn1, J C Prickett1, D A Collins1

  • 1Fera Science Ltd., Sand Hutton, York, YO41 1LZ, United Kingdom.

Veterinary Parasitology
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

Researchers tested 45 agents against the sheep scab mite, Psoroptes ovis. Desiccants, growth regulators, lipid inhibitors, and nerve agents showed the most promise for controlling this ectoparasite.

Keywords:
Control agentsIn vitroNovel compoundsPsoroptes ovisSheep scab

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Area of Science:

  • Veterinary Entomology
  • Parasitology
  • Chemical Ecology

Background:

  • Sheep scab, caused by the mite Psoroptes ovis, is a significant economic concern in sheep farming.
  • Effective and safe control strategies for Psoroptes ovis infestations are crucial for animal welfare and productivity.

Purpose of the Study:

  • To evaluate the in vitro efficacy of various chemical agents against the sheep scab mite, Psoroptes ovis.
  • To identify potential new acaricidal agents for controlling sheep ectoparasites.

Main Methods:

  • In vitro assays were conducted using modified test arenas to simulate off-host conditions for Psoroptes ovis.
  • Forty-five different agents, including essential oils, desiccants, growth regulators, and neurotoxins, were tested.
  • Mortality rates of adult and nymphal Psoroptes ovis were assessed for each agent.

Main Results:

  • Desiccants (diatomaceous earth, nanoclay, sorex) demonstrated high efficacy.
  • Growth regulators (buprofezin, hexythiazox, teflubenzuron) were effective against the mites.
  • Lipid synthesis inhibitors (spirodiclofen, spirotetramat, spiromesifen) showed significant acaricidal activity.
  • Nerve action and energy metabolism inhibitors (fenpyroximate, spinosad, tolfenpyrad, chlorantraniliprole) were also highly effective.

Conclusions:

  • Several classes of chemical agents, including desiccants, growth regulators, lipid synthesis inhibitors, and nerve agents, show significant potential for controlling Psoroptes ovis.
  • These findings provide a basis for further development of novel acaricides against sheep scab mites.