Slaughter Performance, Muscle Quality and Nutritional Components of Twenty-four-month-old Tibetan Goats

24月龄藏山羊屠宰性能、肌肉品质及其营养成分研究（英文）

[Objective] This study was conducted to understand goat germplasm char- acteristics. [Method] With some 24-month-old males and females Tibet goats as experimental materials, a slaughter experiment was carried out to determine their slaughter performance, muscle quality and muscle nutritional components. [Result] The body weights of males and females before slaughter were （20.16±1.26） and （19.33±4.86） kg, respectively; the dressing percentages of males and females were （43.86±1.74）% and （44.08±5.46）%, respectively; the meat percentages were （32.43± 1.52）% and （32.72±3.97）%, respectively; and the meat production rates of carcass were （73.28±0.09）% and （73.16±0.85）%, respectively. There were less differences in carcass measurements, carcass segmentation, muscle quality, muscle fiber charac- teristics, muscle nutritional components, muscle mineral contents and heavy metal contents between males and females, while eye muscle area and hind leg meat weight of males were significantly higher than those of females. In muscles of males and females, 18 amino acids were detected totally, EAA/TAA values were （39.23±0.24）% and （38.70±0.15）%, respectively, and EAA/NEAA values were （64.73± 0.65）% and （63.17±0.41）%, respectively. [Conclusion] This study lays a foundation for overall understanding of germplasm characteristics of Tibetan goats.

[目的]了解藏山羊的种质特性。[方法]以24月龄的藏山羊公、母羊为试验材料,进行屠宰试验并测定其屠宰性能、肌肉品质及肌肉营养成分等。[结果](1)公、母羊宰前体重分别为(20.16±1.26)kg和(19.33±4.86)kg,公、母羊的屠宰率分别为(43.86±1.74)%和(44.08±5.46)%,净肉率分别为(32.43±1.52)%和(32.72±3.97)%,胴体产肉率分别为(73.28±0.09)%和(73.16±0.85)%;(2)胴体体尺、胴体分割、肌肉品质、肌纤维特性、肌肉营养成分、肌肉矿物质含量及其重金属含量等指标在公、母羊间差异较小,公羊的眼肌面积和后腿肉重等指标显著高于母羊(P<0.05);(3)公、母羊肌肉中共检测到18种氨基酸,EAA/TAA分别为(39.23±0.24)%和(38.70±0.15)%,EAA/NEAA分别为(64.73±0.65)%和(63.17±0.41)%。[结论]该研究为全面了解藏山羊的种质特性奠定了基础。