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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Twenty-four-hour profiles of metabolic and stress hormones in sheep selected for a calm or nervous temperament
Domestic Animal Endocrinology, Volume 53, Year 2015
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Description
Even in the absence of stressors, temperament is associated with changes in the concentration of stress-responsive hormones and, possibly because of such changes, temperament can affect metabolism. We tested whether, in sheep bred for temperament for 14 generations, "nervous" females have greater concentrations of stress-responsive hormones in the absence of stressors than "calm" females, and whether these differences are associated with changes in the concentrations of metabolic hormones. In resting "calm" (n = 8) and "nervous" (n = 8) sheep, concentrations of cortisol, prolactin, leptin, and insulin were measured in blood plasma sampled via jugular catheter every 20 min for 24 h. The animals were individually penned, habituated to their housing and human handling over 7 wk, and fed before sampling began. Diurnal variation was evident for all hormones, but a 24-h cortisol pattern was detected in only 7 individuals. There was no effect of temperament on any aspect of concentrations of cortisol or prolactin, but "calm" animals had greater concentrations of insulin in the early afternoon than "nervous" animals (14.5 ± 1.1 vs 10.0 ± 1.6 μU/mL; P = 0.038), and a similar tendency was seen for leptin (P = 0.092). We conclude that selection for temperament affects the concentration of metabolic hormones in the absence of stressors, but this effect is independent of stress-responsive hormones. © 2015 Elsevier Inc.
Authors & Co-Authors
Blackberry, Margaret Anne
Australia, Perth
The University of Western Australia
Maloney, Shane K.
Australia, Perth
The University of Western Australia
Martin, Graeme Bruce
Australia, Perth
The University of Western Australia
Hawken, Penelope Alison Rhian
Australia, Perth
The University of Western Australia
Blache, Dominique B.
Australia, Perth
The University of Western Australia
Statistics
Citations: 11
Authors: 5
Affiliations: 1
Identifiers
Doi:
10.1016/j.domaniend.2015.05.005
ISSN:
07397240
Research Areas
Noncommunicable Diseases
Participants Gender
Female