新疆多浪羊与其他地方品种羊肉贮藏特性比较

摘要

为了探索多浪羊、多浪羊×小尾寒羊的杂交羊以及湖羊3个品种羊肉在-20℃冻藏7d后羊肉贮藏品质及蛋白质特性之间的差异,分别检测3个品种羊肉胶原蛋白含量、肌原纤维小片化指数(myofibrillar fragmentation index,MFI)、挥发性盐基氮(total volatile basic nitrogen,TVB-N)、过氧化值(peroxide value,POV)、蛋白质溶解度及降解度.结果表明,多浪羊肉的MFI显著高于杂交羊和湖羊(p＜0.05),表明多浪羊的嫩度要优于其他2个品种羊肉;在同样条件下冻藏7d,多浪羊肉的TVB-N最低,并且其POV显著低于其他2个品种的羊肉(p＜0.01),表明多浪羊肉具有更优的贮藏特性,这为新疆南疆地区进一步扩大多浪羊的养殖提供了技术支持.%Duolang sheep,small tailed Han sheep and Hu sheep were three local sheep breeds from three different places.The differences of storage quality and protein characteristics among the three sheep breeds were explored after frozen storage for 7 days at-20℃.The collagen content,myofibrillar fragmentation index (MFI),total volatile basic nitrogen (TVB-N),peroxide value (POV),protein solubility and degradation were detected with appropriate methods.The results showed that there were no significant differences between Duolang sheep and the other two sheep breeds in the total collagen and insoluble collagen content.But it had significant differences in MFI values (p ＜0.05).Both indicators were closely related with the tenderness of the muscles.Combined with the previous studies,the tenderness of Duolang sheep was significantly better than the other two breeds.Both TVB-N and POV were significantly different among three breeds.The Duolang sheep was best and the second was Hu sheep.The storage quality of the Duolang sheep was the best.The solubility of the sarcoplasmic protein,myofibrillar protein and total soluble protein were similar in three breeds.However,the degradation of the protein had some differences through SDS-PAGE.There were two obvious loss of the bands or brightness in the lanes of Duolang sheep.It showed that the degradation of the Duolang sheep was slower.All of these results provided the technical support for the further expansion of Duolang sheep in southern Xinjiang.