育肥场育肥的优质南非羔羊的屠宰特性：性别和品种类型的影响。
Slaughter Characteristics of Feedlot-Finished Premium South African Lamb: Effects of Sex and Breed Type.
作者信息
Van der Merwe Daniël André, Brand Tertius Swanepoel, Hoffman Louwrens Christiaan
机构信息
Department of Animal Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
Directorate: Animal Sciences, Department of Agriculture, Western Cape Government, Private Bag X1, Elsenburg 7607, South Africa.
出版信息
Foods. 2020 May 18;9(5):648. doi: 10.3390/foods9050648.
This study compared the carcass characteristics of ram and ewe lambs from South African wool, dual-purpose, meat, and fat-tailed sheep types, reared to produce premium lamb carcasses. The lambs were reared on a feedlot diet (10.41 MJ ME/kg feed and 19.06% crude protein) from weaning (30 kg live weight) until they attained a back-fat depth of 4 mm, measured using ultrasound. After slaughter, the carcasses were assessed for retail cut yields, composition, and physical meat quality. Later, maturing lambs attained heavier carcass weights than early maturing breeds (20.7 kg vs. 16.9 kg, respectively; ≤ 0.05), and differences in carcass composition and retail cut yields were ascribed to differences in the frame size and pattern of fat deposition of the respective breeds. Small differences in physical meat quality were observed, with meat from Dormer and Namaqua lambs having notably higher shear-force values (46 N) than that from Meatmaster carcasses (34 N). These differences though are expected to have little influence on the perceived quality of the meat.
本研究比较了南非羊毛型、兼用型、肉用型和肥尾型绵羊品种的公羊和母羊羔羊的胴体特征，这些羔羊饲养的目的是生产优质羔羊肉胴体。羔羊从断奶（活重30千克）开始在饲养场日粮（每千克饲料含10.41兆焦代谢能和19.06%粗蛋白）条件下饲养，直至通过超声测量其背膘厚度达到约4毫米。屠宰后，对胴体进行零售切块产量、组成和肉质物理特性评估。结果显示，晚熟羔羊的胴体重比早熟品种更重（分别约为20.7千克和16.9千克；P≤0.05），胴体组成和零售切块产量的差异归因于各品种在体格大小和脂肪沉积模式上的差异。在肉质物理特性方面观察到了细微差异，多尔默羊和纳马夸羊的肉的剪切力值（约46牛）明显高于肉用大师羊的肉（约34牛）。不过，预计这些差异对肉的感官品质影响不大。
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