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http://dx.doi.org/10.5713/ajas.17.0013

Effects of confinement on physiological and psychological responses and expression of interleukin 6 and brain derived neurotrophic factor mRNA in primiparous and multiparous weaning sows  

Zhang, Mingyue (College of Animal Science and Technology, Northeast Agricultural University)
Li, Xiang (College of Animal Science and Technology, Northeast Agricultural University)
Li, Jianhong (College of Life Science, Northeast Agricultural University)
Sun, Hanqing (College of Animal Science and Technology, Northeast Agricultural University)
Zhang, Xiaohui (College of Animal Science and Technology, Northeast Agricultural University)
Bao, Jun (College of Animal Science and Technology, Northeast Agricultural University)
Publication Information
Asian-Australasian Journal of Animal Sciences / v.30, no.9, 2017 , pp. 1350-1357 More about this Journal
Abstract
Objective: The present study aimed to investigate whether the long-lasting, recurrent restricting of sows leads to the physiological and psychological reaction of discomfort. Methods: Sows (Large White) that had experienced restricting for about 0.5 or 3 years and agematched sows kept in a group housing system (loose sows) were compared. Pupillary light reflex parameters were measured at the weaning stage. Immediately after slaughter, blood samples were taken to measure serum cortisol levels, and the brain was dissected, gene expression in the hippo-campus, frontal cortex and hypothalamus was analyzed. Results: The serum cortisol levels were higher in the confined sows than in the loose sows. The full maturity, but not the young adolescent, confined sows had longer latency time in the onset of pupil constriction than their loose counterparts. Real-time polymerase chain reaction analyses revealed an increased expression of interleukin 6 mRNA in the hippocampus and decreased expression of brain derived neurotrophic factor mRNA in hippocampus and hypothalamus and to a lesser extent in the frontal cortex of the full maturity confined sows, compared with the full maturity loose sows. Conclusion: Taken together, these data indicated that recurrent restricting stress in full maturity sows leads to the physiological and psychological reaction of discomfort.
Keywords
Confinement Sows; Pupillary Light Reflex; Brain Derived Neurotrophic Factor; Cotisol; Interleukin 6; Hippocampus;
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