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首页> 外文期刊>Animal Feed Science and Technology >Effects of dietary Astragalus polysaccharide and Astragalus membranaceus root supplementation on growth performance, rumen fermentation, immune responses, and antioxidant status of lambs
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Effects of dietary Astragalus polysaccharide and Astragalus membranaceus root supplementation on growth performance, rumen fermentation, immune responses, and antioxidant status of lambs

机译：日粮黄芪多糖和黄芪根对羊羔生长性能，瘤胃发酵，免疫反应和抗氧化状态的影响

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The aim of this study was to investigate effects of dietary Astragalus membranaceus root (AMT) and Astragalus polysaccharide (APS) supplementation on growth performance, blood metabolites, rumen fermentation, immune responses and antioxidant status of weaned lambs. Twenty-four male Ujumqin weaned lambs (a local breed) with average age of 60 +/- 10.3 d and similar genetic background were randomly assigned to one of three treatments for a 30 d feeding period. Treatments consisted of the lambs' basal diets with addition of: (1) nothing (control), (2) 15 g/kg APS or (3) 50 g/kg AMT of the diet (dry matter (DM) basis). Blood samples were collected at day 0 and 30 and ruminal fluid samples at day 0, 15 and 30. Results showed that APS supplementation increased DM intake of lambs (P=0.003), but that average daily gain, feed efficiency and apparent digestibility of nutrients did not differ among treatments. Concentrations of ammonia N (P=0.004) and total volatile fatty acids (P=0.005) were affected by an interaction between treatment and feeding time. Both APS and AMT feeding increased propionic acid (P=0.025) which resulted in a reduction in the acetic acid to propionic acid ratios in ruminal fluid (P=0.014). Feeding APS and AMT increased total antioxidant capacity (P<0.001) and total superoxide dismutase activities (P<0.001), and decreased cortisol levels (P<0.001) in plasma. However, blood plasma metabolites such as blood urea N, high and low density lipoprotein-cholesterol, triglyceride, glucose and total protein, which are reflective of animal metabolism, were not affected by APS and AMT feeding. Only dietary AMT supplementation affected immune responses, including increased immunoglobulin M production (P<0.001) and lymphocyte numbers (P=0.024) in whole blood. Results suggest that APS and AMT feeding mainly improved antioxidant capacity and affected rumen fermentation patterns of lambs, while AMT supplementation affected immunity, but both additives failed to improve apparent digestibility of nutrients in weaned lambs. (C) 2012 Elsevier B.V. All rights reserved.
机译：这项研究的目的是调查日粮黄芪根（AMT）和黄芪多糖（APS）补充对断奶羔羊生长性能，血液代谢产物，瘤胃发酵，免疫反应和抗氧化状态的影响。将24只平均年龄为60 +/- 10.3 d且遗传背景相似的雄性Ujumqin断奶羔羊随机分配给三种处理之一，持续30 d的饲喂期。处理包括羔羊的基础饮食，另外添加：（1）无饮食（对照），（2）15 g / kg APS或（3）50 g / kg AMT的饮食（以干物质（DM）为基础）。在第0和30天采集血样，在第0、15和30天采集瘤胃液。结果表明，补充APS可以增加羔羊的DM摄入量（P = 0.003），但是平均日增重，饲料效率和表观养分消化率治疗之间没有差异。氨氮（P = 0.004）和总挥发性脂肪酸（P = 0.005）的浓度受处理和进料时间之间的相互作用影响。 APS和AMT进料均增加了丙酸（P = 0.025），这导致瘤胃液中乙酸与丙酸的比率降低（P = 0.014）。饲喂APS和AMT可增加血浆中的总抗氧化剂能力（P <0.001）和总超氧化物歧化酶活性（P <0.001），并降低皮质醇水平（P <0.001）。但是，反映动物代谢的血浆代谢物，例如血尿素氮，高和低密度脂蛋白胆固醇，甘油三酯，葡萄糖和总蛋白，不受APS和AMT喂养的影响。仅膳食AMT补充剂会影响免疫反应，包括全血中免疫球蛋白M产生增加（P <0.001）和淋巴细胞数量增加（P = 0.024）。结果表明，APS和AMT喂养主要提高了羔羊的抗氧化能力并影响了瘤胃的发酵方式，而补充AMT则影响了免疫力，但两种添加剂均未能改善断奶羔羊的营养表观消化率。 （C）2012 Elsevier B.V.保留所有权利。

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