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Body temperature patterns during pregnancy and parturition in moose
Anne Randi Græsli1, Alexandra Thiel1, Boris Fuchs1
1Department of Forestry and Wildlife Management, Faculty of Applied Ecology and Agricultural Sciences, Inland Norway University of Applied Sciences, Koppang, Norway.
Journal of Thermal Biology
|October 4, 2022
Summary
Body temperature in moose (Alces alces) increases during pregnancy and drops before parturition. Combining body temperature and activity data accurately detects moose calving events, similar to domestic animals.
Area of Science:
- Animal physiology
- Wildlife ecology
- Reproductive biology
Background:
- Gestation and lactation impose significant energetic demands on female animals.
- Moose (Alces alces) face food scarcity during winter, overlapping with much of their gestation period.
- Hypometabolism, characterized by reduced heart rate and body temperature (Tb), helps moose conserve energy during winter.
Purpose of the Study:
- To investigate if moose exhibit Tb patterns during pregnancy and parturition similar to domestic ruminants.
- To assess the feasibility of detecting parturition in moose using combined Tb and activity data.
Main Methods:
- Studied Tb patterns in 30 free-ranging adult female moose using ruminal temperature loggers and GPS collars.
- Analyzed Tb and activity data in relation to pregnancy status and parturition events.
Main Results:
- Pregnant moose exhibited a 0.13–0.19°C higher Tb compared to non-pregnant individuals.
- A noticeable drop in Tb and activity preceded imminent parturition.
- Combining Tb and activity data achieved a 91.5% accuracy in detecting parturition.
Conclusions:
- Moose display Tb responses to pregnancy and parturition analogous to those observed in domestic ruminants.
- Integrated Tb and activity monitoring offers a reliable method for identifying calving events in wild moose.
- This research provides insights into the physiological adaptations of wild ruminants during critical reproductive periods.
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