A field trial of infrared thermography as a non-invasive diagnostic tool for early detection of digital dermatitis in dairy cows
A field trial of infrared thermography as a non-invasive diagnostic tool for early detection of digital dermatitis in dairy cows
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DOI：
10.1016/j.tvjl.2013.11.028
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发表时间：
2014-02-01
影响因子：
2.2
通讯作者：
Steiner, A.
中科院分区：
文献类型：
--
作者：
Alsaaod, M.;Syring, C.;Steiner, A.
在常规修爪之前，使用红外热像仪(IRT)检测数字皮炎(DD)。共收集了8个农场149头奶牛的1192个IRT观测数据。所有的奶牛都被关在牛栏里。测量前后足冠状支区和皮肤(S)的最高表面温度(每足两指最高表面温度的平均值，CBmax和S最大温度)。分组在足部水平(存在DD，n=99；缺失，n=304)，或在奶牛水平(所有四只脚健康，n=24)，或在后足至少有一个DD病变，n=37)。对于61头奶牛，等温反应温差的计算方法是将后肢的CBmax和S-max的平均值减去前肢的CBmax和S-max的平均值，DD组奶牛的CBmax和S-max高于健足(P<；0.001)。感染性DD病变(M期：M2+M4；n=15)的Smax显著高于非感染性M-病变(M1+M3；n=84)(P=0.03)，而CBmax则无显著差异(P=0.12)。在奶牛水平上，检测DD的最佳截断值为0.99℃(IRT前后足温差)，灵敏度为89.1%，特异度为66.6%。结果表明，IRT可作为一种有效的非侵入性诊断工具，通过测定CBmax和S-max来筛查奶牛DD的存在。(C)2013爱思唯尔有限公司。保留所有权利。
Infrared thermography (IRT) was used to detect digital dermatitis (DD) prior to routine claw trimming. A total of 1192 IRT observations were collected from 149 cows on eight farms. All cows were housed in tiestalls. The maximal surface temperatures of the coronary band (CB) region and skin (S) of the fore and rear feet (mean value of the maximal surface temperatures of both digits for each foot separately, CBmax and S-max) were assessed. Grouping was performed at the foot level (presence of DD, n = 99; absence, n = 304), or at the cow level (all four feet healthy, n = 24) or where there was at least one DD lesion on the rear feet, n = 37). For individual cows (n = 61), IRT temperature difference was determined by subtracting the mean sum of CBmax and S-max of the rear feet from that of the fore feet.Feet with DD had higher CBmax and S-max (P < 0.001) than healthy feet. Smax was significantly higher in feet with infectious DD lesions (M-stage: M2 + M4; n = 15) than in those with non-infectious M-lesions (M1 + M3; n = 84) (P= 0.03), but this was not the case for CBmax (P= 0.12). At the cow level, an optimal cut-off value for detecting DD of 0.99 C (IRT temperature difference between rear and front feet) yielded a sensitivity of 89.1% and a specificity of 66.6%. The results indicate that IRT may be a useful non-invasive diagnostic tool to screen for the presence of DD in dairy cows by measuring CBmax and S-max. (C) 2013 Elsevier Ltd. All rights reserved.