Behavioural lateralization in sheep (Ovis aries)
Behavioural lateralization in sheep (Ovis aries)
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绵羊的行为侧化（Ovis aries）
DOI：
10.1016/j.bbr.2007.06.016
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发表时间：
2007
影响因子：
2.7
通讯作者：
G. Vallortigara
中科院分区：
文献类型：
--
作者：
E. Versace;M. Morgante;Giuseppe Pulina;G. Vallortigara
这项研究调查了不同年龄的绵羊和羔羊的行为侧化。在一项任务中对羊群进行了测试，其中动物面临障碍物，并且应该从右侧或左侧避开障碍物，以重新加入羊群伙伴（成年羊）或它们的母亲（羔羊）。观察到了避开右侧障碍物的偏见，羔羊显然比绵羊更偏侧。这种右偏暂时与熟悉面孔识别中的左半视野偏侧性相关，这已在该物种中得到记录。成年绵羊和羔羊之间的差异可能是由于不同年龄的不同刺激（羊群或母亲）引起的社会恢复动机的差异所致。还在成年动物身上测试了在反刍过程中优先使用前腿踩在木板上以及下巴运动方向的情况。对于前腿的使用，没有观察到群体偏差或个体水平偏侧化。然而，与此同时，尽管不存在群体偏差，但仍有大量动物在反刍过程中下颌运动方向表现出个体水平的偏侧化。这些发现强调，在同一物种内，可以在不同的任务中观察到个体和群体水平的偏侧化。此外，结果符合一般假设，即群体水平的不对称更有可能发生在需要行为不对称个体之间进行社会协调的任务中。
This study investigates behavioural lateralization in sheep and lambs of different ages. A flock was tested in a task in which the animals were facing an obstacle and should avoid it on either the right or left side to rejoin flock-mates (adult sheep) or their mothers (lambs). A bias for avoiding the obstacle on the right side was observed, with lambs apparently being more lateralized than sheep. This right bias was tentatively associated with the left-hemifield laterality in familiar faces recognition which has been documented in this species. Differences between adult sheep and lambs were likely to be due to differences in social reinstatement motivation elicited by different stimuli (flock-mates or mothers) at different ages. Preferential use of the forelegs to step on a wood-board and direction of jaw movement during rumination was also tested in adult animals. No population bias nor individual-level lateralization was observed for use of the forelegs. At the same time, however, there was a large number of animals showing individual-level lateralization for the direction of jaw movement during rumination even though there was no population bias. These findings highlight that within the same species individual- and population-level lateralization can be observed in different tasks. Moreover, the results fit the general hypothesis that population-level asymmetries are more likely to occur in tasks that require social coordination among behaviourally asymmetric individuals.