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Updated: Dec 27, 2025

Handling Techniques to Reduce Stress in Mice
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Puncture versus capture: which stresses animals the most?

Xavier Bonnet1, Gopal Billy2, Margareta Lakušić3

  • 1Centre d'Etudes Biologiques de Chizé, UMR 7372, CNRS ULR, Villiers-en-Bois, France. bonnet@cebc.cnrs.fr.

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
|February 27, 2020
PubMed
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The needle-threshold in animal welfare legislation may not accurately reflect stress in wild animals. Blood sampling in snakes did not increase stress beyond capture, suggesting policy needs to consider species-specific needs.

Area of Science:

  • Animal Welfare Science
  • Wildlife Ecology
  • Physiology

Background:

  • Current animal welfare legislation, like the European directive 2010/63/EU, is primarily based on laboratory rodent studies.
  • This narrow focus raises questions about the applicability of regulations to non-mammalian, free-ranging species.
  • The directive's 'needle-threshold' for determining applicability may be inappropriate for wild animals.

Purpose of the Study:

  • To evaluate the validity of the 'needle-threshold' as a welfare assessment criterion for wild animals.
  • To investigate the stress response of free-ranging snakes to capture and blood sampling procedures.
  • To advocate for policy adjustments that consider the unique challenges of studying wild species.

Main Methods:

  • Utilized physiological markers to assess stress responses in free-ranging snakes.
Keywords:
Animal welfareBlood samplingCorticosteroneGlucoseReptileStress markers

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  • Compared the stress levels associated with capture alone versus capture followed by blood sampling.
  • Focused on non-invasive or minimally invasive techniques relevant to wildlife research.

    • Main Results:

    • Blood sampling did not induce a statistically significant additional stress response in snakes beyond the stress caused by the capture event itself.
    • Physiological stress markers indicated that the impact of needle insertion was negligible compared to the stress of handling and capture.
    • The findings challenge the assumption that needle-based procedures inherently cause greater harm than other common research practices in wild populations.

    Conclusions:

    • The 'needle-threshold' is a questionable metric for assessing the welfare impact of research on wild animals.
    • Animal welfare policies should be adapted to account for the specific ecological and physiological characteristics of free-ranging species.
    • A more nuanced approach is needed to ensure ethical research practices in wildlife studies, moving beyond captivity-centric biases.