| Grassland Short Tailed Sheep is a newly identified excellent variety that has been bred from Hulun Buir Mongolian sheep.However,at present nutrition composition especially the mineral properties of meat and offal of the breed lacks systematic determination and evaluation.A total of 199 heart,lung,liver,kidney,rumen,reticulum,omasum,small intestine and longissimus dorsi samples were collected from 23 Grassland Short Tailed Sheep,26 kinds of mineral elements were determined principal component analysis(PCA)and traditional descriptive statistics were conducted to compared the properties of mineral elements in each offal,longissimus dorsi and different months.The results showed that the overall differences in mineral properties of offal and longissimus dorsi were significant.PCA showed that each offal was clustered separately,and the longissimus dorsi,liver and kidney showed the longest clustering distance,meanwhile the cluster of heart and lung was closer.The stomach and intestine clusters were in the same area,rumen and small intestine clusters were relatively separated.The cluster of reticulum and omasum samples was crossed,suggesting that the mineral properties were generally similar.The contents of Zn(3.32±0.44)mg/100 g,Fe(12.53±3.79)mg/100 g,Cu(3.47±1.58)mg/100 g,Mo(99.63±23.86)μg /100 g and Co(4.80±0.84)μg /100 g in liver were higher.The content of Se(50.18±23.01)μg /100 g in kidney was significantly higher than that in other parts,which could be used as a good Se source of residents daily diet;the omasum was rich in Ca(79.77±53.40)mg/100 g and Mn(412.30±266.70)μg/100g;the contents of K(328.61±44.60)mg/100 g,Mg(25.39±2.35)mg/100 g and Cr(34.84±16.48)μg/100 g in the longissimus dorsi were significantly higher than those in offal.The heavy metal contents in each part did not exceed the limit requirements of national food safety standards for livestock and poultry offal.The contents of Co and Mo,Se and Cd in offal were significantly positive correlation(P<0.01).There were significant differences in mineral contents of the same offal among different months.The contents of K,Na,Se and other 12 mineral elements in sheep offal were increased with the months.Minerals such as Se,Ca,Fe and Cu in offal of Hulun Buir Grassland Short Tailed Sheep were lower than the data in China Food Composition Table(2018).It is suggested that multi-mineral salt bricks or additives should be supplemented in daily feeding of Hulun Buir natural pasturing sheep,and selenium-enriched feeding coulded be recommended to improve the mineral nutrition level of Grassland Short Tailed Sheep in pasturing mode and overcome the regional shortage of minerals,such as Se. |
