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Unraveling the complexity to observe associations between welfare indicators and hair cortisol concentration in dairy calves

Tamminen, Lena-Mari and Keeling, Linda and Svensson, Anna and Briot, Laurie and Emanuelson, Ulf (2021). Unraveling the complexity to observe associations between welfare indicators and hair cortisol concentration in dairy calves. Frontiers in animal science. 2 , 793558
[Research article]

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Abstract

Using levels of the stress hormone cortisol as an indicator for welfare is a common, but debated practice. In this observational study, hair cortisol concentration (HCC) of samples from 196 dairy calves from 7 to 302 days of age collected from 12 Swedish farms was determined using a commercially available ELISA. An assessment of animal welfare, assessed using animal-based indicators, was performed on the day of sampling. First, methodological factors with the potential to impact HCC and the effect of age were analyzed using generalized additive models. This revealed a significant peak in hair cortisol in young calves (around 50 days of age) and an association between fecal contamination of hair samples and the level of cortisol extracted. Second, associations between welfare indicators and HCC were explored using cluster analysis and regularized regression. The results show a complex pattern, possibly related to different coping styles of the calves, and indicators of poor welfare were associated with both increased and decreased hair cortisol levels. High cortisol levels were associated with potential indicators of competition, while low cortisol levels were associated with the signs of poor health or a poor environment. When running the regularized regression analysis without the contaminated hair samples and with the contaminated samples (including a contamination score), the results did not change, indicating that it may be possible to use a contamination score to correct for contamination.

Authors/Creators:Tamminen, Lena-Mari and Keeling, Linda and Svensson, Anna and Briot, Laurie and Emanuelson, Ulf
Title:Unraveling the complexity to observe associations between welfare indicators and hair cortisol concentration in dairy calves
Series Name/Journal:Frontiers in animal science
Year of publishing :2021
Volume:2
Article number:793558
Number of Pages:11
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
URN:NBN:urn:nbn:se:slu:epsilon-p-115551
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-115551
Additional ID:
Type of IDID
DOI10.3389/fanim.2021.793558
ID Code:26762
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
(VH) > Dept. of Animal Environment and Health
Deposited By: SLUpub Connector
Deposited On:20 Jan 2022 13:26
Metadata Last Modified:20 Jan 2022 13:31

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