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Factors affecting mechanical (nociceptive) thresholds in piglets.

Andrew M Janczak1, Birgit Ranheim, Torunn K Fosse

  • 1Department of Production Animal Clinical Sciences, The Norwegian School of Veterinary Science, Oslo, Norway. andrew.janczak@nvh.no

Veterinary Anaesthesia and Analgesia
|June 20, 2012
PubMed
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Repeatability of mechanical nociceptive threshold measurements in piglets is acceptable only in the second week of testing. Piglet age and body weight significantly influence these measures, impacting their use in pain research.

Area of Science:

  • Veterinary Science
  • Animal Physiology
  • Pain Research

Background:

  • Assessing pain and analgesia in animals is crucial for welfare and research.
  • Mechanical nociceptive thresholds provide a quantifiable measure of pain sensitivity.
  • Understanding measurement stability is key for reliable data in preclinical studies.

Purpose of the Study:

  • To evaluate the stability and repeatability of mechanical nociceptive threshold measurements in piglets.
  • To identify factors that may confound these measurements when using a handheld algometer.

Main Methods:

  • A descriptive, prospective cohort study involving 44 piglets (4.6 ± 1.0 kg, 2 weeks old).
  • Mechanical thresholds were measured twice daily over two weeks using a handheld algometer.

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  • Data analyzed using repeated measures, variance component analysis, and Pearson correlations.

    • Main Results:

    • Piglet identity explained only 17% of the data variance.
    • Behavior, week, day, repetition, body weight, and weight-behavior interaction significantly affected thresholds (p < 0.04), except for sex.
    • Measurement repeatability improved from the first to the second week of testing.

    Conclusions:

    • Repeatability of mechanical nociceptive thresholds in piglets is acceptable only in the second week.
    • Piglet age and body weight are critical factors influencing measurements.
    • These thresholds are valuable for assessing anesthetic/analgesic efficacy and hyperalgesia in pain research.