Davies P R, Bahnson P B, Grass J J, Marsh W E, Dial G D
Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul 55108, USA.
Am J Vet Res. 1995 Jun;56(6):09-14.
A rapid subjective method for estimating the extent of gross pneumonia lesions in slaughtered pigs was compared with dissection of lungs in 51 slaughtered pigs. After standardization for prevalence in the regional industry, regression analysis indicated that the subjective method was highly predictive of the extent of pneumonic lesions (R2 = 0.88). Part of the error with the subjective method was attributed to approximations used for the relative proportions of lung lobes, which result in overestimation of the affected tissue by approximately 20%. Retrospective analysis of data from a slaughter monitoring program revealed strong associations (R2, 0.54 to 0.91) between prevalence, mean, median, and maximal lung scores in groups of pigs. Maximal lung score was biased by sample size, but prevalence and mean or median lung scores could be used to describe pneumonia severity in groups of pigs. Our results indicate that error in measurement of the extent of pneumonic tissue in slaughtered pigs is unimportant if the time of onset, clinical severity, and duration of disease are not quantified.
将一种用于估计屠宰猪大体肺炎病变程度的快速主观方法与51头屠宰猪的肺脏解剖结果进行了比较。在对该地区行业中的患病率进行标准化后，回归分析表明，主观方法对肺炎病变程度具有高度预测性（R2 = 0.88）。主观方法的部分误差归因于对肺叶相对比例所采用的近似值，这导致受影响组织的估计值高估了约20%。对屠宰监测项目数据的回顾性分析显示，猪群中的患病率、平均、中位数和最大肺脏评分之间存在强关联（R2为0.54至0.91）。最大肺脏评分受样本量的影响，但患病率以及平均或中位数肺脏评分可用于描述猪群中的肺炎严重程度。我们的结果表明，如果疾病的发病时间、临床严重程度和持续时间未进行量化，那么屠宰猪肺炎组织范围测量中的误差并不重要。
