Abstract
Abstract This study aimed to validate the relationship between pupillary light reflex (PLR) and stereotypic behaviors or serum neurotransmitters in confined sows. Eight long PLR latency (LL) sows (reaction time ≥10 seconds) and 8 short PLR latency (SL) sows (time of PLR P > 0.05). Sitting in LL sows was significantly higher ( P ≤ 0.05), and grooming was lower in frequency ( P P > 0.05), but trough-biting and sham-chewing in LL sows were higher than for SL sows ( P ≤ 0.05). However, DA and 5-HT levels were higher in LL sows than SL sows ( P = 0.05 and P = 0.02, respectively). The results also indicated that bar-biting was negatively correlated with 5-HT levels ( r = 0.542; P r = 0.582; P r = 0.499; P = 0.01). The results of this study suggest that sows' PLR is related to serum neurotransmitters and stereotypic behaviors and that the prolonged latency of PLR might have potential to be indicator of chronic stress or depression.
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