富硒酵母对奶牛抗氧化能力和免疫功能的影响

目的:研究富硒酵母对妊娠奶牛抗氧化能力和免疫功能的影响。方法:选用24头妊娠健康黑白花母牛为受试奶牛,等分为4组。1组为对照(C组),余为受试T1,T2,T3组,分别添加三种硒制剂:即奥特奇公司的富硒酵母(Sel plex 50) 、有机硒无机硒混合物(70% Sel plex 50+30%亚硒酸钠)以及亚硒酸钠组。实验期168 d。在试验期第40、70、125 d时测定血中GSH-Px、SOD活性、MDA含量、硒水平以及淋巴细胞转化率和T细胞计数。结果:在125 d时,GSH-Px活性、SOD酶活性、血清硒浓度,T1、T2、T3组均显著或非常显著高于C组;MDA 水平T1、T2、T3组非常显著低于C组;同时,淋巴细胞转化率和T细胞计数,T1、T2组非常显著高于C组。三个试验组中T1与 T3组比,P<0.01,说明T1组效果优于T2、T3组。结论:富硒酵母(Sel plex 50)改善奶牛的抗氧化能力和免疫功能的效果比无机硒好。

EFFECTS OF SELENIUM ENRICHED YEAST ON ANTIOXIDATIVE ACTIVITIES AND IMMUNE FUNCTIONS IN PREGNANT DAIRY COWS

Objective: To investigate the effects of selenium enriched yeast on antioxidative activities and immune functions in pregnant dairy cows. Methods: Twenty-four healthy Holstein-Friesian dairy cows were used for the experiment. All of them were pregnant as comfirmed by rectal palpation and divided into 4 groups, of which 3 were assigned for test groups(TI, T2, T3) and one served as control (C). Three different selenium (Se) sources namely Se-yeast (Sel Plex50, from Alltech ), mixture of Se compounds (70% Sel Plex 50 30% Na selenite ) and Na selenite were respectively supplemented to 3 test groups. Whole feeding experiment lasted for 168 days. During the experiment, the blood GSH-Px activity, serum Se concentration, erythrocyte superoxide dismutase(SOD) activity, malonaldehyde(MDA) level in serum, lymphocyte transformation rate and T cell count were determined. Results: Blood GSH-Px ,serum Se concentration and erythrocyte SOD activity,T1, T2 and T3 were higher (P<0.0l) than control after 125 days of Se supplementation. MDA concentration in serum was markedly or very markedly lower than control group. At the same time, the lymphocyte transformation rates and T cell counts in T1 and T2 were much higher (P<0.0l) and in T3 was higher (P<0.05) than control. T1 was higher(P<0.05) than T2 and T3 . Conclusion: Organic Se supplementation could significantly enhance animal's immune function , promote lymphocyte proliferation , phagocytosis of neutrophils and antioxidative activities as well.