Fear and coping styles of outdoor-preferring, moderate-outdoor and indoor-preferring free-range laying hens
Fear and coping styles of outdoor-preferring, moderate-outdoor and indoor-preferring free-range laying hens
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DOI：
10.1016/j.applanim.2016.09.004
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发表时间：
2016-12-01
影响因子：
2.3
通讯作者：
Lee, Caroline
中科院分区：
文献类型：
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作者：
Campbell, Dana L. M.;Hinch, Geoff N.;Lee, Caroline
自由放养系统越来越受欢迎，因为人们认为户外活动可以改善母鸡的福利，但对个体的射频识别跟踪显示，并非所有母鸡每天都进入养鸡场，有些母鸡从不外出。范围使用的个体差异可能与恐惧和应对方式的个体差异有关。在本研究中，对37-39周龄的ISA褐鸡（Gallus Gallus domesticus, n = 104）进行了强直不动、手动约束（加上血浆皮质酮反应）和露天饲养试验。根据试验期间外出活动天数的百分比，将焦点母鸡分为三个不同的鸡场活动组：室内偏好（在0-10%的可用天数内进入鸡场）、中度户外（在30-60%的可用天数内进入鸡场）和户外偏好（在100%的可用天数内进入鸡场）。与中度户外和户外偏好的母鸡相比，室内偏好的母鸡在人工约束期间发出的声音更少（P= 0.004），并且倾向于发出更慢的声音（P= 0.08），但在第一次挣扎的潜伏期（P= 0.55），挣扎次数（P= 0.44）或血浆皮质酮反应（P= 0.82）方面没有发现差异。在野外试验中，与室外偏好母鸡相比，室内偏好母鸡和中等户外偏好母鸡表现出更长的移动潜伏期和更少的方块交叉(P
Free-range systems are increasing in popularity as outdoor access is perceived to improve hen welfare, but radio-frequency identification tracking of individuals shows not all hens access the range daily with some hens never going outside. The individual variation in range use may be correlated with individual differences in fear and coping styles. In this study, tests of tonic immobility, manual restraint (coupled with plasma corticosterone responses) and open field were applied to ISA Brown hens (Gallus gallus domesticus: n = 104) at 37-39 weeks of age. Focal hens were selected as categorised into three different range access groups based on the percentage of available days across the trial period that they went outdoors: indoor-preferring (accessed the range on 0-10% of available days), moderate-outdoor (accessed the range on 30-60% of available days), and outdoor-preferring (accessed the range on 100% of available days). The indoor-preferring hens produced fewer vocalisations during manual restraint compared to the moderate-outdoor and outdoor-preferring hens (P= 0.004) and tended to be slower to vocalise (P= 0.08) but no differences were found in latency to first struggle (P= 0.55), number of struggles (P= 0.44) or plasma corticosterone responses (P= 0.82). During the open field tests, the indoor-preferring and moderate outdoor hens showed longer latencies to move and fewer squares were crossed compared to outdoor preferring hens (P