A study of operator effects on ultrasonic measures of fat depth and longissimus muscle area in cattle, sheep and pigs.
A study of operator effects on ultrasonic measures of fat depth and longissimus muscle area in cattle, sheep and pigs.
复制标题
操作员对牛、羊和猪脂肪深度和最长肌面积超声测量影响的研究。
DOI：
10.2527/1991.69154x
复制
发表时间：
1991
影响因子：
3.3
通讯作者：
F. Mckeith
中科院分区：
文献类型：
--
作者：
D. Mclaren;J. Novakofski;D. Parrett;L. Lo;S. D. Singh;K. Neumann;F. Mckeith
在肉类动物改善计划中使用实时超声检查，这在很大程度上增加了此类工具在测量longissimus肌肉面积（LMA）和脂肪深度（BF）方面的准确性。这项研究的目的是检查算子在市场权重牛，绵羊和猪中超声测定BF和LMA的效果。屠杀前一天，使用A模式ITHACO Model 731AM101身体成分表（ABF）和Johnson和Johnson Ultrasound 210DX B模式扫描仪，五人在最后一个肋骨上扫描了45头猪，32只绵羊和18头牛。 MHz探针。所有操作员都测量了自己的B模式录音（OBF，Olma）；独立的，经验丰富的技术人员还从所有记录（TBF，TLMA）中获得了测量。对于超声BF，检测到物种X机器X算子的交互作用（P小于.001）。物种内分析还表明，对于所有物种而言，机器X运算符相互作用很重要（P小于.001）。除TLMA以外的所有性状（P小于.20）以外，对ABF，OBF，TBF，OLMA和TLMA检测到的物种X算子相互作用（P小于.001）。假设具有动物，操作员和残余效应的随机模型，则通过每个物种的最大似然估计方差成分。重复性是由不同操作员扫描和解释的BF和LMA的动物之间的类内相关性，.13，.21和.51（OBF）和.28，.28，.15，.15和.15和.29（Olma）牛，牛，羊和猪，分别表明了操作员效应的重要性。 TBF的重复性为.90，.42和.68和TLMA的重复性分别为.19，.55和.65，分别为牛，绵羊和猪，这表明图像解释在确定与使用210dx B使用相关的效应方面的重要性 - 模式扫描仪。因此，必须为此类设备的运营商建立技术培训标准。
Use of real-time ultrasonography in meat animal improvement programs has increased largely as a result of the perceived accuracy of such instruments in measuring longissimus muscle area (LMA) and fat depth (BF). The objective of this study was to examine operator effects for ultrasonic determination of BF and LMA in market-weight cattle, sheep and pigs. The day prior to slaughter, five persons scanned 45 pigs, 32 sheep and 18 cattle at the last rib using an A-mode Ithaco Model 731AM101 body composition meter (ABF) and a Johnson and Johnson Ultrasound 210DX B-mode scanner fitted with a 3.0 MHz probe. All operators measured their own B-mode recordings (OBF, OLMA); an independent, experienced technician also obtained measurements from all recordings (TBF, TLMA). Species x machine x operator interaction effects were detected (P less than .001) for ultrasonic BF. Within-species analyses also revealed that the machine x operator interaction was important (P less than .001) for all species. Analyses of ABF, OBF, TBF, OLMA and TLMA detected species x operator interactions (P less than .001) for all traits except TLMA (P less than .20). Assuming a random model with animal, operator and residual effects, variance components were estimated by maximum likelihood for each species. Repeatabilities, calculated as the intraclass correlation among animals for BF and LMA scanned and interpreted by different operators, were .13, .21 and .51 (OBF) and .28, .15 and .29 (OLMA) for cattle, sheep and pigs, respectively, indicating the importance of operator effects. Repeatabilities of TBF were .90, .42 and .68 and of TLMA were .19, .55 and .65 for cattle, sheep and pigs, respectively, indicating the importance of image interpretation in determining operator effects associated with use of the 210DX B-mode scanner. Technical training standards must, therefore, be established for operators of such equipment.