![Page 1: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/1.jpg)
Agriculture and Agriculture etAgri-Food Canada Agroalimentaire Canada
Infrared thermography and heart rate
variability for non-invasive assessment of
animal welfare.
ANZCCART 2008
Mairi Stewart
Jim Webster, Kevin Stafford & Allan Schaefer
![Page 2: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/2.jpg)
•Measures emitted radiated heat (represents 40-60% of heat loss from an animal)
•Non-invasive – images collected from a distance
•Can detect changes in heat loss during stress (due to regulation of peripheral blood flow)
What is infrared thermography ?
![Page 3: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/3.jpg)
Photo from U.S. Department of Defence Polygraph
You can't hide your lying eyes…
![Page 4: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/4.jpg)
Approach
Measure responses to routine husbandry procedures used on-farm (eg handling, disbudding)
![Page 5: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/5.jpg)
38
38.2
38.4
38.6
38.8
39
39.2
-120 -60 0 60 120 180
Time (sec)
Eye
tem
pera
ture
(o
C)fright
![Page 6: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/6.jpg)
Autonomic Nervous System
Restores energy reserves
Mobilises energy reserves
Parasympathetic Sympathetic
-vasodilation - vasoconstriction
- secretion of catecholamines
![Page 7: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/7.jpg)
What is heart rate variability?• Non-invasive
• Cardiac interbeat (RR) interval = time between successive R waves
• Provides more accurate measure of stress than heart rate
• Allows measurement of sympathetic and parasympathetic responses
Components of the ECG
![Page 8: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/8.jpg)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Control Disbud only Local only Disbud + local
Ch
an
ge
in L
F/H
F r
atio
Heart rate variability - disbudding- Sympathetic Nervous System Indicator
***
![Page 9: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/9.jpg)
36.6
37
37.4
37.8
38.2
-25 -20 -15 -10 -5 0 5 10 15
Time (min)
Ma
x e
ye
te
mp
era
ture
(oC
)
Control
LA only
Disbud only
LA + Disbud
Eye temperature - disbudding
******
*
baseline LA Disbud
vasoconstrictionTime (min)
![Page 10: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/10.jpg)
Adrenaline challenge – eye temperature
37.7
37.8
37.9
38
38.1
38.2
-15 -10 -5 0 5 10 15
Time (min)
Eye
tem
pera
ture
(oC
)
Epinephrine
Saline
infusion
![Page 11: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/11.jpg)
Summary
• Eye temperature dropped in response to:• fright • painful procedure• adrenaline
• Evidence that the drop in eye temperature is mediated by sympathetic activity
![Page 12: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/12.jpg)
Conclusions1. A combination of eye temperature and HRV is a
useful non-invasive assessment of autonomic activity.
2. May be an alternative to invasive methods currently used to assess farm animal welfare.
![Page 13: Agriculture and Agriculture et Agri-Food Canada Agroalimentaire Canada Infrared thermography and heart rate variability for non-invasive assessment of](https://reader036.vdocument.in/reader036/viewer/2022070414/5697c0221a28abf838cd339e/html5/thumbnails/13.jpg)
Questions?