Hair Cortisol Levels in Pigs on Organic Farms
Author Information
Author(s): Nadlučnik Eva, Vake Tilen, Šket Ana, Žižek Ana, Snoj Tomaž, Štukelj Marina
Primary Institution: University of Ljubljana, Slovenia
Hypothesis
Does seasonality, breeding system, and sex influence hair cortisol concentration in pigs reared on organic farms?
Conclusion
The study found that hair cortisol concentrations were highest in winter and varied significantly by breeding system and season, with no effect of sex.
Supporting Evidence
- Hair cortisol concentrations were highest in winter for all groups.
- Group Ind had significantly higher HCC in summer compared to outdoor groups.
- Seasonality and housing type significantly influenced HCC levels.
Takeaway
This study shows that pigs' stress levels, measured by hair cortisol, change with the seasons and how they are raised, but being indoors can help keep them less stressed.
Methodology
The study involved 53 pigs divided into three groups based on housing (indoor or outdoor) and sampled hair for cortisol levels across four seasons.
Potential Biases
Potential bias from environmental factors affecting cortisol levels, such as UV exposure and individual pig responses to stress.
Limitations
The study's findings may be influenced by the age of the pigs coinciding with the seasons, and indoor temperature measurements were not taken.
Participant Demographics
53 pigs of the indigenous Slovenian Krškopolje breed, including 27 females and 26 castrated males.
Statistical Information
P-Value
<0.001
Confidence Interval
95%
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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