Alsaaod M, Syring C, Dietrich J, Doherr M G, Gujan T, Steiner A
Clinic for Ruminants, Vetsuisse-Faculty, University of Bern, Switzerland.
Clinic for Ruminants, Vetsuisse-Faculty, University of Bern, Switzerland.
Vet J. 2014 Feb;199(2):281-5. doi: 10.1016/j.tvjl.2013.11.028. Epub 2013 Dec 6.
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 tie-stalls. 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 Smax) 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 Smax of the rear feet from that of the fore feet. Feet with DD had higher CBmax and Smax (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 Smax.
在常规修蹄前，采用红外热成像（IRT）技术检测趾间皮炎（DD）。从8个农场的149头奶牛身上共收集了1192次IRT观测数据。所有奶牛均饲养在拴系牛舍中。评估了前后蹄冠带（CB）区域和皮肤（S）的最高表面温度（分别为每只蹄两个趾头的最高表面温度的平均值，即CBmax和Smax）。分组是在蹄的层面进行（存在DD，n = 99；不存在，n = 304），或者在奶牛层面进行（四只蹄均健康，n = 24），或者后蹄至少有一个DD病变，n = 37）。对于个体奶牛（n = 61），IRT温度差通过用前蹄的CBmax和Smax的平均总和减去后蹄的该平均总和来确定。患有DD的蹄的CBmax和Smax高于健康蹄（P<0.001）。有传染性DD病变（M期：M2 + M4；n = 15）的蹄的Smax显著高于有非传染性M病变（M1 + M3；n = 84）的蹄（P = 0.03），但CBmax并非如此（P = 0.12）。在奶牛层面，检测DD的最佳临界值为0.99°C（前后蹄之间的IRT温度差），灵敏度为89.1%，特异性为66.6%。结果表明，IRT通过测量CBmax和Smax可能是一种有用的非侵入性诊断工具，用于筛查奶牛是否存在DD。
