Effects of dietary mangenese level on blood immune parameter of Liaoning cashmere

The purpose of this study was to evaluate and improve immune performance of Liaoning cashmere by sifting the optimum level of dietary manganese. 60 healthy 2.5yearold Liaoning cashmeres with similar body weight (34.160.90 kg) were used, and evenly divided into four groups at random. The cashmeres in each group were fed with basal diet and supplemented with manganese of 0, 20, 40, and 60 mgkg-1 DM, respectively. Blood samples were taken to determine the contents of albumin (ALB), total protein (TP), immunoglobulin (IgA,IgG,IgM) and the activities of AST and ALT in the serum of Liaoning cashmere during nonpregnant period, 1 month and 4 month of pregnancy. The results showed that, adding manganese had no effects on activities of ALT, AST and VFI, and could increase body weight. The serum contents of ALB in 20 mgkg-1 DM manganese group were significantly higher than that in basal diet group, the serum contents of TP in 20 mgkg-1 DM manganese group were significantly lower than that in the other three groups, the serum contents of IgM in supplementing manganese groups were significantly higher than that in basal diet group during nonpregnant period (P0.05), and the contents of TP, IgA, IgG in 40 mgkg-1 DM manganese were significantly higher than that in basal diet group in 4 month of pregnancy (P0.05). It is concluded that dietary supplementation with manganese at 20 mgkg-1 DM (dietary manganese level is 60 mgkg-1 DM) during nonpregnant period and at 40 mgkg-1 DM (dietary manganese level is 80 mgkg-1 DM) during pregnant period can effectively improve immune performance of Liaoning cashmere.