評估超音波測定豬體組成性狀的儀器與操作者效應

Evaluation of machine and operator effects on ultrasonic measures of body composition traits in pigs

羅玲玲(Ling-Ling Lo) ； 蔡政樵(Cheng-Chaio Tsai) ； 康雅淳(Ya-Chun Kang)

《華岡農科學報》 43期 (2019/06) Pp. 97-114

摘要

採用60頭杜洛克、藍瑞斯及約克夏去勢公豬，於檢定結束時（平均日齡Mean = 193.8, SD = 11.6 d;平均體重Mean = 115.1, SD = 8.8 kg），由三位操作人員（OP1, OP2, OP3）以兩種B模式超音波儀器（ALOKA SSD 500與ProSound 2），測定第10肋骨部位脂肪深度、腰眼深度及腰眼面積，評估超音波測定豬隻脂肪深度與腰眼面積的儀器與操作者效應。三位操作人員中包括一位合格技師（OP1）、操作較熟練技師（OP2）及受過訓練但較少操作的人員（OP3）。採用ALOKA SSD 500與ProSound 2，OP1超音波活體與屠體測定第10肋脂肪深度的相關係數範圍0.9063至0.9138，OP2與OP3分別為0.7388至0.7909與0.7478至0.7948。超音波測定脂肪深度與腰眼面積之機型效應顯著（P ＜ 0.05），但超音波與屠體測定之絕對值差異值並不顯著（P ＞ 0.05）。採用兩機型測定第10肋腰眼面積，OP1活體與屠體測定相關係數範圍0.8644至0.9326，OP2與OP3分別為0.5276至0.6342與0.5759至0.5779。活體與屠體腰眼面積測定絕對值差異，OP1顯著低於OP2與OP3（P ＜ 0.05）；使用ProSound 2也顯著低於SSD 500（P ＜ 0.05）。本試驗發現兩種機型並不影響操作者測定脂肪深度；應用ProSound 2測定腰眼面積準確性高於SSD 500（P ＜ 0.05），指出B模式超音波儀器測定脂肪深度時操作者彼此可以替代，但針對特定機型影像的解讀是重要的，建立技師的訓練標準需針對特定機型，進一步超音波技師的技術評估與認證方式需要進一步探討。

關鍵字

B模式超音波 ； 體組成 ； 儀器 ； 操作者效應

並列摘要

Sixty Duroc, Landrace and Yorkshire barrows were measured at off-test (off-test age: Mean = 193.8, SD = 11.6 d; off-test weight: Mean = 115.1, SD = 8.8 kg) by three different level operators (OP1, OP2, and OP3) using two different B mode ultrasonic machines (ALOKA SSD 500 and ProSound 2). Measures included fat depth, longissimus muscle depth, and longissimus muscle area at the 10^(th) rib to evaluate machine and operator effects on body composition traits. All pigs were transported to the Taiwan Farm Industry Company for slaughter and collection of the relevant carcass data. The three operators include a qualified technician (OP1), a more skilled technician (OP2) and a trained but less operational person (OP3), using two different machines, OP1 gave the correlation coefficients between ultrasonic and carcass measures of 10^(th) rib fat depth ranged from 0.9063 to 0.9138, and the OP2 and OP3 were 0.7388 to 0.7909 and 0.7478 to 0.7948, respectively. For 10^(th) rib fat depth and longissimus muscle area, the effect of machine was highly significant (P ＜0.05), however, the machine effect for absolute differences between scanned and carcass measured 10^(th) rib fat and longissimus muscle area were not different (P ＞ 0.05). The correlations between scan and carcass measured longissimus muscle area were ranged from 0.8644 to 0.9326 for OP1 and were 0.5276 to 0.6342 and 0.5759 to 0.5779 OP2 and OP3, respectively. The absolute difference between scanned and carcass measured longissimus muscle area was lower for OP1 than that of OP2 and OP3 (P ＜ 0.05), and using ProSound 2 was also significantly lower than SSD 500 (P ＜ 0.05). The study found that the two machine types do not affect the operator's determination on fat depth; the accuracy of the longissimus muscle area using ProSound 2 is higher than that of SSD 500 (P ＜ 0.05), indicated that the operator can be replaced each other for fat depth using the B mode machine, but the interpreting images for specific machine is important. Technical training standards is therefore need to be established for operators using the two types of machines.

並列關鍵字

B mode ultrasound ； body composition ； machine ； operator effect