黄芪多糖对奶牛生产性能、抗氧化能力和免疫功能的影响OA

[Objective]To investigate the effects of Astragalus polysaccharides on production performance,antioxidant capacity and immune function of dairy cows,and to provide theoretical basis for improving dairy cattle breeding efficiency and health management.[Method]Seventy-two cows with similar first litter,milk production and body condition were selected and randomly divided into four groups:control group(CON),low-dose group(APS 1.5),medium-dose group(APS 3.0)and high-dose group(APS 4.5).The control group was fed the basal diet,and the other three groups were fed the basal diet supplemented with 1.5,3.0,and 4.5 g/kg Astragalus polysaccharide,respectively.The pre-experimental period lasted 15 d,and the formal experimental period lasted 60 d.during which milk production,milk composition,antioxidant indicators and immune indicators were monitored and analyzed.[Result]Milk production in the APS 3.0 group was significantly improved,milk protein rate,milk fat rate and dry matter content were improved,and somatic cell number was significantly reduced;serum total antioxidant capacity(T-AOC),superoxide dismutase(SOD),glutathione peroxidase(GSH-Px)activities were significantly increased,and malondialdehyde(MDA)content was significantly reduced in each experiment group;The immunoglobulin IgA and IgM contents in the astragalus polysaccharide-supplemented groups were significantly increased,while the tumor necrosis factor-α(TNF-α)content was significantly decreased,with the medium-dose group showing the optimal effect.[Conclusion]Astragalus polysaccharide cansignificantly improve the production performance of dairy cows,enhance antioxidant capacity and immune function,among which 3.0 g/kg addition has the best effect and has high application value in breeding.