Clustering and synchrony in laying hens: The effect of environmental resources on social dynamics
Clustering and synchrony in laying hens: The effect of environmental resources on social dynamics
复制标题
DOI：
10.1016/j.applanim.2010.10.007
复制
发表时间：
2011-01-15
影响因子：
2.3
通讯作者：
Nicol, Christine J.
中科院分区：
文献类型：
--
作者：
Collins, Lisa M.;Asher, Lucy;Nicol, Christine J.
蛋鸡通常会选择聚集在一起，但我们不知道饲养它们的环境对社会群体动态的影响程度。本文考虑了钢笔环境对空间聚类的影响。试验选取12组4只蛋鸡，分别在铁丝地板(W)、刨花（Sh）和栖木、泥炭、巢箱和刨花（PPN） 3种环境条件下进行试验。每个小组都经历了两次不同的环境，每次持续五周，每个小组都有不同的系统顺序。每周1天录像，连续30周。为了确定聚类水平，我们从每个视频随机选择的20分钟摘录中记录位置数据（总共分析了20分钟x 360视频）。在屏幕上，笔被分成六个相等的区域。此外，PPN围栏被划分为另外四个（子）区域，以考虑到栖木的使用（每一半栖木一个区域）。每隔5秒，我们记录每只鸟的位置，并计算随时间推移的位置使用情况，每种环境的喂食同步和群集得分。将饲养同步性和群集得分与未加权和加权（根据观察到的比例位置使用）泊松分布进行比较，以区分资源和社会吸引力。在加权和非加权分布假设下，所有环境中的聚类都大于预期。在所有环境中，观察到的单只母鸡少于预期，而在非加权分布中，在饲养地点观察到的两只或更多母鸡组多于预期。总之，我们发现所有环境下的母鸡都聚集在一起，但聚集似乎是资源利用而不是社会凝聚力的结果。(C) 2010 Elsevier B.V.版权所有
Laying hens generally choose to aggregate, but the extent to which the environments in which we house them impact on social group dynamics is not known. In this paper the effect of pen environment on spatial clustering is considered. Twelve groups of four laying hens were studied under three environmental conditions: wire floor (W), shavings (Sh) and perches, peat, nestbox and shavings (PPN). Groups experienced each environment twice, for five weeks each time, in a systematic order that varied from group to group. Video recordings were made one day per week for 30 weeks. To determine level of clustering, we recorded positional data from a randomly selected 20-min excerpt per video (a total of 20 min x 360 videos analysed). On screen, pens were divided into six equal areas. In addition, PPN pens were divided into an additional four (sub) areas, to account for the use of perches (one area per half perch). Every 5 s, we recorded the location of each bird and calculated location use over time, feeding synchrony and cluster scores for each environment. Feeding synchrony and cluster scores were compared against unweighted and weighted (according to observed proportional location use) Poisson distributions to distinguish between resource and social attraction.Clustering was greater than expected in all environments under both weighted and unweighted distribution assumptions. In all environments, singleton hens were observed less than expected, and groups of two or more were observed in the feeding location more than expected in an unweighted distribution. In conclusion, it was found that hens in all environments clustered: however clustering appeared to result from resource-use rather than social cohesion. (C) 2010 Elsevier B.V. All rights reserved.