Lateralized behaviour as indicator of affective state in dairy cows.
Lateralized behaviour as indicator of affective state in dairy cows.
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DOI：
10.1371/journal.pone.0184933
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Whay HR
中科院分区：
文献类型：
--
作者：
Kappel S;Mendl MT;Barrett DC;Murrell JC;Whay HR
在人类中，有证据表明，对新的或威胁性刺激的感觉处理是右半球主导的，特别是在经历负面情感状态的人。在一些非人类的动物物种中也有类似的偏侧化的证据。在这里，我们调查家牛是否也是这种情况，由于普遍存在的情况，如跛行，家牛可能会经历长期的负面状态。与跛行奶牛疼痛相关的健康和福利影响是奶牛养殖业的一个主要问题。结合动物行为和认知的行为测试可以对我们理解动物感觉加工过程中与疾病相关的变化做出有意义的贡献，从而提高它们的福利。我们向216头荷斯坦-弗里斯奶牛展示了三种不同的陌生物体，它们被放置在两侧(例如两个黄色聚会气球，两个黑白棋盘)或中央悬挂(一个孔™)在熟悉的区域内。奶牛连续三天单独接触这些物体，并评估它们在接近过程中的观看偏好/眼睛使用、探索行为/鼻孔使用和停止位置。在测试期间重复对活动能力(跛行)进行评分。总体而言，在双侧客体的初始呈现时，发现偏向于观看右侧客体而不是左侧客体。更多的奶牛也用鼻子探索右边的物体，而不是左边的物体。有一种趋势是，奶牛在接近物体时显得犹豫不决，停在离物体一段距离的地方，然后探索左边的物体，而不是右边的物体。相比之下，直接接近物体的奶牛更倾向于接触正确的物体。当奶牛探索位于中心的物体时，没有发现使用右眼或左眼/鼻孔的显著偏好。我们没有发现跛行和偏侧行为之间的关系。然而，观察到的趋势表明，对位于两侧的陌生物体的偏侧化行为可能反映了一种即时的情感反应。需要进一步的研究来理解长期情感状态对大脑半球优势和偏侧化行为的影响。
In humans, there is evidence that sensory processing of novel or threatening stimuli is right hemisphere dominated, especially in people experiencing negative affective states. There is also evidence for similar lateralization in a number of non-human animal species. Here we investigate whether this is also the case in domestic cattle that may experience long-term negative states due to commonly occurring conditions such as lameness. Health and welfare implications associated with pain in lame cows are a major concern in dairy farming. Behavioural tests combining animal behaviour and cognition could make a meaningful contribution to our understanding of disease-related changes in sensory processing in animals, and consequently enhance their welfare. We presented 216 lactating Holstein-Friesian cows with three different unfamiliar objects which were placed either bilaterally (e.g. two yellow party balloons, two black/white checkerboards) or hung centrally (a Kong™) within a familiar area. Cows were individually exposed to the objects on three consecutive days, and their viewing preference/eye use, exploration behaviour/nostril use, and stop position during approach was assessed. Mobility (lameness) was repeatedly scored during the testing period. Overall, a bias to view the right rather than the left object was found at initial presentation of the bilateral objects. More cows also explored the right object rather than the left object with their nose. There was a trend for cows appearing hesitant in approaching the objects by stopping at a distance to them, to then explore the left object rather than the right. In contrast, cows that approached the objects directly had a greater tendency to contact the right object. No significant preference in right or left eye/nostril use was found when cows explored the centrally-located object. We found no relationship between lameness and lateralized behaviour. Nevertheless, observed trends suggesting that lateralized behaviour in response to bilaterally located unfamiliar objects may reflect an immediate affective response are discussed. Further study is needed to understand the impact of long-term affective states on hemispheric dominance and lateralized behaviour.
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