Meier-Dinkel Lisa, Gertheiss Jan, Müller Simone, Wesoly Raffael, Mörlein Daniel
Department of Animal Sciences, Meat Quality Section, University of Goettingen, D-37075 Goettingen, Germany.
Department of Animal Sciences, Biometrics and Bioinformatics Section, University of Goettingen, D-37075 Goettingen, Germany.
Meat Sci. 2015 Feb;100:73-84. doi: 10.1016/j.meatsci.2014.09.013. Epub 2014 Sep 28.
Detection of malodours referred to as 'boar taint' in entire male pigs is essential for quality control when refraining piglet castration. This study analysed the sensitivity and specificity of sensory evaluation by trained assessors (n=18) compared to chemical analysis of two marker compounds (androstenone, skatole) in backfat (n=794). Taking the measurement uncertainty into consideration, several cut-off thresholds for chemical analysis were exemplarily evaluated. Using the panel average score, sensitivity and specificity of sensory analysis ranged from 61 to 69% and 77 to 85%, respectively. Performance of individual assessors varied highly (sensitivity: 47 to 86%; specificity: 45 to 88%) and correlated to olfactory acuity to the compounds. According to receiver operating characteristic-curves, the average panel performed better than single assessors regardless of the sensory criterion shift. Agreement plots illustrate that high skatole levels are better detected than high androstenone levels (useful for assessor feedback). The agreement between sensory and chemical analyses was moderate. Assessors need to be selected carefully.
在避免仔猪阉割时，检测完整雄性猪中被称为“公猪异味”的恶臭对于质量控制至关重要。本研究分析了18名经过训练的评估员进行感官评估的敏感性和特异性，并与794份背膘中两种标记化合物（雄烯酮、粪臭素）的化学分析结果进行了比较。考虑到测量不确定度，示例性地评估了化学分析的几个临界阈值。使用小组平均得分，感官分析的敏感性和特异性分别为61%至69%和77%至85%。个体评估员的表现差异很大（敏感性：47%至86%；特异性：45%至88%），并且与对这些化合物的嗅觉敏锐度相关。根据受试者工作特征曲线，无论感官标准如何变化，小组平均表现均优于单个评估员。一致性图表明，高粪臭素水平比高雄烯酮水平更容易被检测到（这对评估员反馈很有用）。感官分析和化学分析之间的一致性为中等。需要仔细挑选评估员。
