Seasonal changes and sufficiency or lack analysis of trace elements in grazing system in Stipa breviflora desert steppe

In order to provide scientific basis for preventing diseases of trace elements metabolism of livestock, the contents of trace elements were investigated and analyzed in grazing system in Stipa breviflora desert steppe in Siziwang area of Inner Mongolia.The detection of trace minerals in soilforagesheep ecosystem was performed using the methods of sampling in the field and lab analysis. The results showed that the soil is lack of Cu and Se critically. The pasture is rich in Fe and Mn, however, it is lack of Se. The indicators were also compared between local sheep and health sheep, and we found that the content of Fe was higher than the normal value in summer and autumn, and the content of Mn was higher than normal value in the whole year in the plasma. In contrast, the content of Se was lower than the normal value in autumn and the content of Cu was lower than the normal value in winter in the plasma. Furthermore, the contents of Fe and Mn were higher than the normal values in the whole year, and the content of Cu was lower than the critical values in the winter in the liver. Meanwhile, the content of Se in the liver was lower than the normal value in autumn and winter. The content of Fe was higher than the normal value and the contents of Cu and Se were lower than the normal values in the whole year in the wool. Using the comprehensive analyses of intake, digestibility of minerals, the results revealed that in this area the contents of Fe and Mn are high, and the contents of Se is low. The contents of Cu and Zn are low seasonally.