Changes in tail posture detected by a 3D machine vision system are associated with injury from damaging behaviours and ill health on commercial pig farms.
Changes in tail posture detected by a 3D machine vision system are associated with injury from damaging behaviours and ill health on commercial pig farms.
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DOI：
10.1371/journal.pone.0258895
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Baxter EM
中科院分区：
文献类型：
--
作者：
D'Eath RB;Foister S;Jack M;Bowers N;Zhu Q;Barclay D;Baxter EM
为了确定猪尾巴的姿势是否受到伤害和健康状况的影响，使用了一种使用3D摄像机测量尾巴角度的机器视觉系统。通过每14（±10）天访问一次农场，对7个不同的生长/肥育商业猪场17个月内41个生产批次（42.4（±16.6）天）的1692头猪的摄像机数据进行验证，以对损伤和健康状况进行评分。尾部姿态的线性建模发现了相当大的农场和批次效应。尾部保持低位（0°）或中位（1-45°）的百分比随时间推移分别从54.9%和23.8%下降至-0.16和-0.05%/天，而尾部保持高位（45-90°）的百分比从21.5%上升至0.20%/天。虽然22%的评分猪有抓伤尾巴，但严重的咬尾是罕见的;只有6%的猪有尾巴伤口，5%的猪有部分尾巴丢失。将尾部损伤添加到模型中显示与尾部姿势相关：总体尾部损伤、尾部损伤恶化和尾部损失与更多的猪检测到低尾姿势和更少的高尾姿势相关。轻微的尾部损伤和尾部肿胀也与尾部姿势的改变有关。出乎意料的是，其他健康和损伤评分对尾部姿势的影响更大-当围栏中较大比例的猪被评分为社会攻击引起的跛行或病变时，观察到更多的低尾。耳朵受伤与减少高尾巴有关。这些发现与低尾姿势可能是福利差的一般指标的想法是一致的。然而，侧面咬和眼分泌物对尾姿势的影响与此不一致。我们的研究结果首次表明，在正常的时间趋势的尾部姿态的扰动与咬尾和其他迹象的不利健康/福利在不同的商业农场，形成决策支持系统的基础。
To establish whether pig tail posture is affected by injuries and ill health, a machine vision system using 3D cameras to measure tail angle was used. Camera data from 1692 pigs in 41 production batches of 42.4 (±16.6) days in length over 17 months at seven diverse grower/finisher commercial pig farms, was validated by visiting farms every 14(±10) days to score injury and ill health. Linear modelling of tail posture found considerable farm and batch effects. The percentage of tails held low (0°) or mid (1–45°) decreased over time from 54.9% and 23.8% respectively by -0.16 and -0.05%/day, while tails high (45–90°) increased from 21.5% by 0.20%/day. Although 22% of scored pigs had scratched tails, severe tail biting was rare; only 6% had tail wounds and 5% partial tail loss. Adding tail injury to models showed associations with tail posture: overall tail injury, worsening tail injury, and tail loss were associated with more pigs detected with low tail posture and fewer with high tails. Minor tail injuries and tail swelling were also associated with altered tail posture. Unexpectedly, other health and injury scores had a larger effect on tail posture- more low tails were observed when a greater proportion of pigs in a pen were scored with lameness or lesions caused by social aggression. Ear injuries were linked with reduced high tails. These findings are consistent with the idea that low tail posture could be a general indicator of poor welfare. However, effects of flank biting and ocular discharge on tail posture were not consistent with this. Our results show for the first time that perturbations in the normal time trends of tail posture are associated with tail biting and other signs of adverse health/welfare at diverse commercial farms, forming the basis for a decision support system.
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影响因子：
5.1
作者：
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通讯作者：
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影响因子：
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影响因子：
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