Use of a tri-axial accelerometer for automated recording and classification of goats' grazing behaviour
Use of a tri-axial accelerometer for automated recording and classification of goats' grazing behaviour
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DOI：
10.1016/j.applanim.2009.04.008
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发表时间：
2009-07-01
影响因子：
2.3
通讯作者：
Schlecht, Eva
中科院分区：
文献类型：
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作者：
Moreau, Maeg;Siebert, Stefan;Schlecht, Eva
在德国中部（52小时登记）和阿曼北方（70小时登记）的崎岖的山区牧场上，对一个便宜的三轴加速计的山羊活动在牧场上的自动记录的适用性进行了测试。记录器要么安装在胸带上，要么安装在狗背带上，要么安装在项圈上。该设备每秒钟（德国）或每两秒（阿曼）记录动物的加速度和头部倾斜度的变化。为了校准和验证记录器的登记，观察员同时记录山羊的活动，区分行走，休息和进食;后者进一步细分为放牧（低头）和浏览（抬头）。将加速度计记录与观察数据合并，输入到专门设计的计算机程序中，该程序计算转换的加速度计数据的移动平均值，并选择阈值以区分休息与进食以及进食与行走。从第一只山羊的数据集建立的校准功能进行了验证，从第二只山羊安装有相同的挽具类型的数据。由加速度计和相应的程序检测到的活动的真实识别范围从87%到93%的进食，68%到90%的休息和20%到92%的步行。对于休息和行走，它受到用于记录器固定的安装系统类型的影响（固定效应; P <0.001），对于休息和进食，受观察次数的影响（协变量; P <0.01）。使用狗挽具，该程序分别在75 - 82%和61 - 71%的观察病例中正确识别了头向上和头向下的位置。有了用于校准的可靠数据集，只要使用相同的挽具类型，就可以对不同个体和不同畜牧系统的山羊活动进行可靠的自动分类。(C)2009 Elsevier B.V.保留所有权利。
The suitability of an inexpensive tri-axial accelerometer for the automated recording of goats' activities at pasture was tested on a slightly undulating pasture in Central Germany (52 h of registry) and on a rugged mountainous pasture in northern Oman (70 h of registry). The logger was either mounted onto a chest belt, a dog harness or a neck collar. The device registered the animals' acceleration and changes in head inclination every second (Germany) or every two seconds (Oman). To calibrate and validate the logger's registries, an observer simultaneously recorded the goats' activities, distinguishing between walking, resting and eating; the latter was further subdivided into grazing (head-down) and browsing (head-up). Merged with the observation data, the accelerometer recordings were imported into a specially designed computer programme that calculated moving averages for the transformed accelerometer data and selected threshold values to distinguish resting from eating and eating from walking. Calibration functions established from data sets of a first goat were validated with data from a second goat fitted with the same harness type.The true recognition of activities detected by the accelerometer and the corresponding programme ranged from 87% to 93% for eating, 68% to 90% for resting and 20% to 92% for walking. It was affected, for resting and walking, by the type of mounting system used for logger fixation (fixed effect; P < 0.001) and, for resting and eating, by the number of observations (covariable; P < 0.01). Using a dog harness, the programme correctly recognized head-up and head-down positions in 75-82% and in 61-71 % of the observed cases, respectively. With solid data sets for the calibration, a reliable automated classification of goats' activities is possible across different individuals and across husbandry systems, provided that the same harness type is used. (C) 2009 Elsevier B.V. All rights reserved.