Knupp Leonardo Sidney, Lunesu Mondina Francesca, Costa Roberto Germano, Ledda Mauro, Knupp Sheila Nogueira Ribeiro, Acciaro Marco, Decandia Mauro, Molle Giovanni, Francesconi Ana Helena Dias, Cannas Antonello
Departamento de Zootecnia, Universidade Federal da Paraíba, Rodovia BR 079 km 12, Areia 58397-000, Brazil.
Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia 39, 07100 Sassari, Italy.
Animals (Basel). 2021 May 18;11(5):1440. doi: 10.3390/ani11051440.
This work aimed to compare pre- and post-slaughter methodologies to estimate body fat reserves in dairy goats. Twenty-six lactating Saanen goats ranging from 43.6 to 69.4 kg of body weight (BW) and from 1.84 to 2.96 of body condition score (BCS; 0-5 range) were used. Fifteen pre-slaughter and four post-slaughter measurement values were used to estimate the weight of fat in the omental (OM), mesenteric (MES), perirenal (PR), organ (ORG), carcass (CARC), and non-carcass components (NC) and total (TOT, calculated as the sum of CARC and NC) depots in goats. The pre-slaughter measurements were withers height; rump height; rump length; pelvis width; chest depth; shoulder width; heart girth; body length; sternum height; BW; BCS assessed in the lumbar (BCSl) and sternal (BCSs) regions; and fat thickness measured by ultrasound in the lumbar (FTUSl), sternal (FTUSs), and perirenal (FTUSpr) regions. The post-slaughter measurements were hot carcass weight (HCW), empty body weight (EBW), and fat thickness measured by digital caliper in the lumbar (FTDCl) and sternal (FTDCs) regions. Linear and multiple regressions were fit to data collected. BW, BCS (from lumbar and sternal regions), all somatic measurements, and fat thickness measured by ultrasound in the lumbar and sternal regions were not adequate to estimate the weight of total fat in lactating Saanen goats ( ≤ 0.55). The best pre-slaughter and post-slaughter estimators of OM, MES, PR, ORG, NC, and TOT fat were FTUSpr and EBW, respectively. Among pre- and post-slaughter measurements, BCSl ( = 0.63) and HCW ( = 0.82) provided the most accurate predictions of CARC fat, respectively. Multiple regression using the pre-slaughter variables FTUSpr, BW, and BCSl yielded estimates of TOT fat with an = 0.92 (RSD = 1.14 kg). On the other hand, TOT fat predicted using the post-slaughter variables HCW and FTDCs had an = 0.83 (RSD = 1.41 kg). These results confirm that fat reserves can be predicted in lactating Saanen goats with high precision using multiple regression equations combining in vivo measurements.
这项工作旨在比较屠宰前和屠宰后的方法，以估算奶山羊的体脂储备。使用了26只体重在43.6至69.4千克之间、体况评分（BCS；0 - 5范围）在1.84至2.96之间的泌乳萨能山羊。使用15个屠宰前测量值和4个屠宰后测量值来估算山羊网膜（OM）、肠系膜（MES）、肾周（PR）、器官（ORG）、胴体（CARC）和非胴体成分（NC）以及总（TOT，计算为CARC和NC之和）脂肪库的脂肪重量。屠宰前测量包括鬐甲高度、臀高、臀长、骨盆宽度、胸深、肩宽、胸围、体长、胸骨高度、体重、在腰椎（BCSl）和胸骨（BCSs）区域评估的体况评分，以及通过超声在腰椎（FTUSl）、胸骨（FTUSs）和肾周（FTUSpr）区域测量的脂肪厚度。屠宰后测量包括热胴体重（HCW）、空体重（EBW），以及通过数字卡尺在腰椎（FTDCl）和胸骨（FTDCs）区域测量的脂肪厚度。对收集的数据进行线性和多元回归拟合。体重、体况评分（来自腰椎和胸骨区域）、所有体尺测量值以及通过超声在腰椎和胸骨区域测量的脂肪厚度，均不足以估算泌乳萨能山羊的总脂肪重量（≤0.55）。对于OM、MES、PR、ORG、NC和TOT脂肪，最佳的屠宰前和屠宰后估计指标分别是FTUSpr和EBW。在屠宰前和屠宰后测量中，BCSl（ = 0.63）和HCW（ = 0.82）分别对CARC脂肪提供了最准确的预测。使用屠宰前变量FTUSpr、体重和BCSl进行多元回归得出的TOT脂肪估计值， = 0.92（RSD = 1.14千克）。另一方面，使用屠宰后变量HCW和FTDCs预测的TOT脂肪， = 0.83（RSD = 1.41千克）。这些结果证实，通过结合活体测量的多元回归方程，可以高精度地预测泌乳萨能山羊的脂肪储备。
