富硒黄芪多糖对坝上长尾鸡抗氧化功能、脂代谢、组织硒含量及免疫功能的影响.

【Objective】The present paper aimed to explore the influence of the selenium-enriched astragalus polysaccharide（ SAPS） on antioxidant function,lipid metabolism,tissue selenium content and immunity of Bashang long-tailed chickens.【Method】The experiment adopted a completely randomized trial design according to the routine feeding management and regulations. 1000 healthy Bashang long-tailed chicken aged 30 weeks were selected. The chickens were randomly divided into 5 groups with 10 replocates per group and 20 chickens for each replicatie. The experimental groups were fed the basal diet supplemented with 0. 1%（ groupⅠ）,0. 3%（ groupⅡ）,0. 5%（ group Ⅲ）,0. 7%（ group Ⅳ） and 0. 9%（ group Ⅴ） selenium-enriched astragalus polysaccharide.【Result】Compared with group I, with the addition dose of the selenium-enriched astragalus polysaccharide from 0. 1% to 0. 9%,SOD and GSH PX in group III were significantly increased by 0. 13% and 0. 4%,respectively（ P < 0. 05）,and there was no significant effect between group III and other groups（ P > 0. 05）; MDA content was the lowest in group III, but there were no significant differences among test groups（ P > 0. 05）. Plasma cholesterol in group III was significantly lower than that in group I,II,IV and V by 0. 9%,0. 6%,0. 3% and0. 6%,respectively（ P < 0. 05）. The selenium-enriched astragalus polysaccharide had no significant effects on Liver cholesterol（ P > 0. 05）.Triglyceride: compared with group V, triglyceride in group III was decreased by 0. 9%（ P < 0. 05）,but there was no significant difference compared with other test groups（ P > 0. 05）,and liver triglyceride in group III was significantly lower than group V by 0. 98%（ P < 0. 05）.Egg selenium content in group III was the highest, which was higher than that in other groups by 4. 67%,4. 28%,4. 04% and 4. 28%（ P <0. 05）. Compared with groupⅠand groupⅤ, serum selenium content in group Ⅲ was significantly increased by 6. 60% and 4. 87%（ P <0. 05）. Liver selenium content in group Ⅲ was higher than that in groupⅠand groupⅤ by 4. 79% and 4. 12%（ P < 0. 05）. Kidney seleniumin content in group Ⅲ was increased by 4. 61%,3. 58%,3. 95% and 4. 77%,respectively（ P < 0. 05）. Spleen index: there were significant effects among group Ⅲ and groupⅠ, groupⅡand groupⅤ（ P < 0. 05）. Compared with low dose groups, bursa of fabricius index in groupⅢ was significantly increased（ P < 0. 05）. Newcastle disease antibody at 7 days age: group Ⅲ was the highest, and there were significant effects among groupⅠ,groupⅡ and groupⅤ（ P < 0. 05）; And group Ⅲ was significantly increased than groupⅤ by 18%（ P < 0. 05）,groupⅢ was significantly increased than groupⅠby 16%（ P < 0. 05） at 10 days age; 7 days age: compared with groupⅠ, groupⅡand groupⅤ, Avian influenza antibody in group Ⅲ was the highest, and there were significant differences among groups（ P < 0. 05）; compared with groupⅤ, antibody titer in group Ⅲ was increased by 19%（ P < 0. 05）,and the differences among groupⅡ,group Ⅳand groupⅤ were significant（ P >0. 05）.【Conclusion】The results indicated that the selenium-enriched astragalus polysaccharide added into the basal diet could improve the antioxidant function and tissue selenium content, and enhance the immunity and lipid metabolism ability. The dosage of 0. 5% was more advantageous. [ABSTRACT FROM AUTHOR]