Hair cortisol determination in sows in two consecutive reproductive cycles |
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| Institution: | 2. Agriculture & Agri-Food Canada, Agassiz, BC, V0M 1A0 Canada;3. Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran 91775-1163;1. Department of Animal Health and Anatomy, Veterinary Faculty, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;2. Department of Animal and Food Science, Veterinary Faculty, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;1. Unit of Physiology, Pathophysiology and Experimental Endocrinology, Department for Biomedical Sciences, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria;2. University Clinic for Ruminants, Department of Farm Animal and Public Health in Veterinary Medicine, University of Veterinary Medicine Vienna, Veterinärplatz 1, 1210 Vienna, Austria;2. College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran 91775-1163;3. Agriculture & Agri-Food Canada, Agassiz, BC, V0M 1A0 Canada;1. Institute for Global Food Security, School of Biological Sciences, Queen''s University Belfast, Belfast, BT9 5DL, UK;2. Monogastric Research Group, Sustainable Agri-Food Sciences Division, Agri-Food and Bioscience Institute, Belfast, BT26 6DR, UK;3. Interdisciplinary Laboratory of Clinical Analysis, Interlab-UMU, University of Murcia, 30100, Campus de Espinardo s/n, Murcia, Spain |
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| Abstract: | Hair analysis has been proposed as a minimally invasive technique capable of furnishing information regarding the stress response during medium- and long-term periods. Bristle samples were collected from the rump region of sows at three key physiological phases (before delivery – BD; weaning time – WT; pregnancy diagnosis – PD) during consecutive reproductive cycles in order to test swine hair as a reliable matrix of cortisol evaluation. Cortisol was extracted from the bristles and assayed using radioimmunoassay. The highest mean hair cortisol concentrations were demonstrated (p < 0.001) at the PD time points (20.1 ± .95 and 16.29 ± 2.15 pg/mg). Moreover, cortisol was significantly higher (p < 0.001) at BD2 (10.48 ± 0.96 pg/mg) as compared to BD1 (5.17 ± 0.51 pg/mg) and WT1 (6.01 ± 0.47 pg/mg). The various physiological phases had a significant effect on cortisol concentration (p < 0.00001) with a higher cortisol concentration found during late pregnancy and lactation than in early-mid pregnancy. This could be due not only to the physiological hormonal status, but also to the different housing conditions (single crates vs. group housing). The season of the year was also observed to have an effect (p < 0.005), with the lowest cortisol concentration recorded during the hot season. |
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| Keywords: | Swine Hair Cortisol Chronic stress Reproduction |
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