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Surface temperature elevated by chronic and intermittent stress.

Katherine A Herborn¹, Paul Jerem², Ruedi G Nager²

¹Institute of Biodiversity, Animal Health & Comparative Medicine, University of Glasgow, Jarrett Building, Glasgow G61 1QH, UK.

Physiology & Behavior

|April 10, 2018

Summary

This summary is machine-generated.

Infrared thermography (IRT) can detect chronic stress in laying hens by monitoring skin temperature changes. Increased comb, face, and eye temperatures indicate long-term stress exposure in these animals.

Keywords:

Body temperature Gallus gallus domesticus chronic stress enrichment infrared thermography welfare

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Area of Science:

Animal Welfare Science
Animal Physiology
Behavioral Science

Background:

Stress in animals impacts body temperature and blood flow.
Infrared thermography (IRT) detects acute stress via surface temperature drops.
The potential of IRT for chronic stress detection in animals is largely unknown.

Purpose of the Study:

To investigate the long-term effects of environmental enrichment withdrawal and handling on laying hen skin temperature.
To determine if IRT can serve as a non-invasive marker for chronic stress in laying hens.

Main Methods:

Laying hens were housed in either enriched or barren conditions.
Environmental enrichments were withdrawn, and intermittent handling was applied.
Skin surface temperatures (comb, face, eye) were monitored using IRT.
Corticosterone levels and behavioral markers of stress were assessed.

Main Results:

Immediately after enrichment withdrawal, comb, face, and eye temperatures dropped.
Barren-housed hens showed increased corticosterone levels and comb temperature over time compared to controls.
Skin temperatures were higher on days following routine handling.
Comb temperature was higher in regularly handled hens compared to those with less intensive handling.

Conclusions:

Increased comb, face, and eye surface temperature can serve as a long-term indicator of stress in laying hens.
IRT offers a potential non-invasive method for monitoring chronic and intermittent stress in managed animal populations.
The utility of IRT may be influenced by thermoregulatory and energetic factors.