Sleep‐related behaviors in zoo‐housed giraffes ( Giraffa camelopardalis reticulata ): Basic characteristics and effects of season and parturition
Sleep‐related behaviors in zoo‐housed giraffes ( Giraffa camelopardalis reticulata ): Basic characteristics and effects of season and parturition
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动物园饲养的长颈鹿（Giraffacamelopardalis reticulata）的睡眠相关行为：基本特征以及季节和分娩的影响
DOI：
10.1002/zoo.21511
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发表时间：
2019
期刊：
影响因子：
1.3
通讯作者：
Yamanashi Yumi
中科院分区：
文献类型：
--
作者：
Takagi Naoko;Saito Miho;Ito Hideyuki;Tanaka Masayuki;Yamanashi Yumi
尽管人们对动物园动物的行为越来越感兴趣，但对动物园动物夜间行为的研究仍然有限。在这项研究中，我们研究了圈养网纹长颈鹿的分娩、季节和睡眠相关行为之间的关系，以更好地了解长颈鹿的夜间生活。研究对象是生活在日本京都市动物园的两只成年网纹长颈鹿。 2007 年 6 月至 2009 年 8 月期间，通过安装在室内围栏内的红外摄像机进行了观察。我们分析了 16:30 至第二天早上 09:00 之间录制的视频片段，总共 199 天。根据长颈鹿的姿势，与睡眠相关的行为分为两类：卧姿和矛盾的睡眠。我们还记录了卧姿的侧向性，这是根据腿部相对于躯干的方向（右或左）进行编码的。在两个人中都观察到夏季和冬季睡眠行为的季节性差异。他们在冬天往往比夏天更早开始躺下。分娩也影响了行为，因为两个人在女性分娩前后都减少了行为。此外，在产前恢复卧姿时，女性左侧卧的频率低于右侧卧的频率，而在基线和产后期间没有观察到这种偏侧性。这些结果表明季节和分娩是决定长颈鹿睡眠相关行为的重要因素。需要进一步的研究来了解睡眠的这些变化如何影响其他福利参数。
Despite increasing interest in the behavior of zoo animals, studies of nocturnal behavior of zoo animals are limited. In this study, we investigated the relationship between parturition, season, and the sleep‐related behaviors in captive reticulated giraffes to better understand the nocturnal life in giraffes. The subjects were two adult reticulated giraffes living in Kyoto City Zoo, Japan. Observations were made via an infrared camera that was mounted in the indoor enclosure between June 2007 and August 2009. We analyzed video clips that were recorded between 16:30 and 09:00 the next morning, over a total of 199 days. Sleep‐related behaviors were classified into two categories based on the posture of the giraffes; recumbent posture and paradoxical sleep. We also recorded the laterality of recumbent posture, which was coded based on the direction of the legs against the torso (right or left). Seasonal differences in sleep behaviors between summer and winter were observed in both individuals. They tended to start to lie down earlier in the winter than in the summer. Parturition also affected the behaviors as both individuals decreased the behaviors before and after the parturition of the female. Additionally, the female lay on her left side less frequently than her right when resuming a recumbent posture in the pre‐parturition period, while such laterality was not observed in the baseline and post‐parturition period. These results suggested that season and parturition are important factors for determining the sleep‐related behaviors in giraffes. Further studies are needed to understand how these changes in sleep affect other welfare parameters.