The purpose of this study was to test if associations exist between plasma indicators of acute and chronic stress and lamb loin Warner Bratzler Shear Force (WBSF). Blood was collected at exsanguination from 2877 lambs from the Meat and Livestock Genetic Research flock with a suite of indicators analysed. Loin (M. longissimus lumborum) WBSF was measured after 5 days aging. Plasma indicators of stress did not relate to WBSF, however a positive association was found between WBSF and kill order, indicating that immediate pre-slaughter factors may be causing reduced tenderness in lamb. In addition, selection for decreased fat depth (PFAT) was associated with increased loin WSBF, indicating that genetic selection for increased carcass leanness is negatively affecting lamb loin tenderness.

这项研究的目的是检验急性和慢性应激的血浆指标与羊腰华纳·布拉茨勒剪切力（WBSF）之间是否存在关联。放血时，从肉类和家畜遗传研究群的2877只羊羔身上采血，并分析了一系列指标。老化5天后测量腰部（M. longissimus lumborum）WBSF。血浆应激指标与WBSF无关，但是在WBSF与杀死顺序之间发现正相关，表明直接宰杀前的因素可能导致羔羊嫩感降低。此外，降低脂肪深度（PFAT）的选择与里脊WSBF的增加有关，这表明提高for体瘦度的遗传选择对羔羊里脊肉的嫩度有负面影响。