Behavioural and physiological responses to an acute stressor in crib-biting and control
Behavioural and physiological responses to an acute stressor in crib-biting and control
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DOI：
10.1016/s0168-1591(03)00086-8
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发表时间：
2003-08-02
影响因子：
2.3
通讯作者：
Stauffacher, M
中科院分区：
文献类型：
--
作者：
Bachmann, I;Bernasconi, P;Stauffacher, M
研究了11对咬婴儿马和不咬婴儿马(对照组)对唤醒刺激的反应。对这些马的视频观察显示，咬婴儿床的马在马厩里花了10.4%到64.7%的时间进行刻板印象。在实验的前两天，这些马被训练成从一个特殊的桶里接受食物。第三天，送来了食物桶，但马被禁止进食。记录安静时、食物刺激过程中和食物刺激后的觉醒行为和咬床强度，以及血浆皮质醇浓度、心率(HR)和心率变异性(HRV)。刺激使咬婴儿者和对照组的心率和唤醒行为显著增加，而咬婴儿的频率降低。心率变异性的功率谱分析显示，咬婴儿组与对照组在静息状态下有显著差异：咬婴儿组迷走神经张力(高频成分)低于对照组，交感神经张力(低频成分)高于对照组。较低的基础副交感神经活动可能是一个迹象，为什么咬婴儿床的马在呈现食物刺激时没有表现出明显的HF成分减少，也没有表现出呈现后HF成分的增加。因此，咬婴儿马和对照马在自主神经系统的调节和应激反应方面可能会有所不同。结果表明，咬婴儿床的马比对照组的马对压力更敏感，在生理和心理上的灵活性更差。(C)2003 Elsevier Science B.V.保留所有权利。
The responses of eleven pairs of crib-biting and non-crib-biting horses (controls) to an arousal-inducing stimulus were studied. Video-observation of the horses revealed that crib-biting horses spent between 10.4 and 64.7% of their stabling time performing the stereotypy. During the first 2 days of an experimental period, the horses were conditioned to receive food from a special bucket. On the third day the food bucket was presented, but the horses were not allowed to feed. Arousal behaviour and crib-biting intensity as well as plasma cortisol concentration, heart rate (HR) and heart rate variability (HRV) were recorded at rest, and during and after presentation of the food stimulus. The stimulus induced a significant increase of HR and arousal behaviour in crib-biters and in controls, whereas the crib-biting frequency decreased. Power spectral analysis of the HRV revealed significant differences between crib-biters and controls at rest: crib-biters had a lower vagal tone (high frequency component, HF) and a higher sympathetic tone (low frequency component, LF) than controls. The lower basal parasympathetic activity might be an indication why crib-biting horses, in contrast to the controls, showed neither a significant decrease of the HF component during presentation of the food stimulus nor an increase of the HF component after presentation. Thus, there might be differences in the tuning of the autonomous nervous system and of the stress reactivity in crib-biting and in control horses. The results suggest that the crib-biting horses are more stress sensitive and physiologically and psychologically less flexible than the control horses. (C) 2003 Elsevier Science B.V. All rights reserved.