Avril Dean H, Lallo Cicero, Mlambo Victor, Bourne Gregory
Open Tropical Forages-Animal Production Laboratory, Department of Food Production, Faculty of Science and Agriculture, The University of the West Indies, St. Augustine Campus, Port of Spain, Trinidad and Tobago,
Trop Anim Health Prod. 2013 Nov;45(8):1803-8. doi: 10.1007/s11250-013-0438-8. Epub 2013 Jul 14.
Animal management for breeding and marketing can be improved by precise measurement of desirable traits. Live animal body composition analysis facilitates the selection of animals that are best suited for the intended purpose. This study was designed to assess the accuracy of bioelectrical impedance analysis (BIA) predicted live body tissue composition, as a proxy for the estimation of carcass quality in Barbados Black Belly lambs. Thirty-four Barbados Black Belly lambs were placed on an 8-week feeding regime and then slaughtered. A randomized experimental design was used to allocate diets to animals, which had been stratified into eight groups by initial live weight. The lambs were fed a basal diet of Brachiaria arrecta fresh forage ad libitum and subjected to one of four diets; NS-non-supplemented diet, TG-Trichantera gigantea-supplemented, C100-concentrate supplemented for maintenance, and C400-concentrate supplemented for growth. Diets NS, TG, C100, and C400 had 7, 9, 11, and 7 animals, respectively. The average age and weight at the time of slaughter were 206 days and 23.7 kg, respectively. A 4-terminal impedance analyzer (RJL Systems®) was used to generate BIA data from live animals immediately before slaughter. The chilled carcasses were then subject to chemical analysis for crude fat, crude protein, and dry matter. Live animal and carcass traits predicted by BIA included fat and fat-free mass, crude fat, crude protein, protein to fat ratio, and tissue distribution. Regression equations were developed from BIA data obtained from the live animal to predict all carcass composition traits measured. Bioelectrical impedance analysis generated favorable results as a practical application to carcass composition evaluation in live tropical hair sheep.
通过精确测量理想性状，可以改善用于繁殖和销售的动物管理。活体动物身体成分分析有助于选择最适合预期用途的动物。本研究旨在评估生物电阻抗分析（BIA）预测活体组织成分的准确性，以此作为估算巴巴多斯黑腹羊胴体品质的替代方法。34只巴巴多斯黑腹羊接受了为期8周的饲养，然后屠宰。采用随机实验设计将日粮分配给动物，这些动物已按初始活重分为八组。给羔羊自由采食臂形草新鲜牧草作为基础日粮，并分别给予四种日粮之一：NS-不添加日粮、TG-添加大花钩粉草日粮、C100-添加维持用浓缩料日粮、C400-添加生长用浓缩料日粮。日粮NS、TG、C100和C400分别有7、9、11和7只动物。屠宰时的平均年龄和体重分别为206天和23.7千克。在屠宰前，使用四端阻抗分析仪（RJL Systems®）从活体动物获取BIA数据。然后对冷却后的胴体进行粗脂肪、粗蛋白和干物质的化学分析。BIA预测的活体动物和胴体性状包括脂肪和去脂体重、粗脂肪、粗蛋白、蛋白与脂肪比以及组织分布。根据从活体动物获得的BIA数据建立回归方程，以预测所测量的所有胴体成分性状。作为一种用于评估热带活体毛羊胴体成分的实际应用方法，生物电阻抗分析产生了良好的结果。
