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首页> 外文期刊>Applied Microbiology >Bacterial and Protozoal Communities and Fatty Acid Profile in the Rumen of Sheep Fed a Diet Containing Added Tannins
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Bacterial and Protozoal Communities and Fatty Acid Profile in the Rumen of Sheep Fed a Diet Containing Added Tannins

机译：羊肉瘤胃中细菌和原生动物群落和脂肪酸谱的研究

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This study evaluated the effects of tannins on ruminal biohydrogenation (BH) due to shifts in the ruminal microbial environment in sheep. Thirteen lambs (45 days of age) were assigned to two dietary treatments: seven lambs were fed a barley-based concentrate (control group) while the other six lambs received the same concentrate with supplemental quebracho tannins (9.57% of dry matter). At 122 days of age, the lambs were slaughtered, and the ruminal contents were subjected to fatty acid analysis and sampled to quantify populations of Butyrivibrio fibrisolvens , which converts C_(18:2) c 9- c 12 (linoleic acid [LA]) to C_(18:2) c 9- t 11 (rumenic acid [RA]) and then RA to C_(18:1) t 11 (vaccenic acid [VA]); we also sampled for Butyrivibrio proteoclasticus , which converts VA to C_(18:0) (stearic acid [SA]). Tannins increased ( P < 0.005) VA in the rumen compared to the tannin-free diet. The concentration of SA was not affected by tannins. The SA/VA ratio was lower ( P < 0.005) for the tannin-fed lambs than for the controls, suggesting that the last step of the BH process was inhibited by tannins. The B. proteoclasticus population was lower (?30.6%; P < 0.1), and B. fibrisolvens and protozoan populations were higher (+107% and +56.1%, respectively; P < 0.05) in the rumen of lambs fed the tannin-supplemented diet than in controls. These results suggest that quebracho tannins altered BH by changing ruminal microbial populations.
机译：这项研究评估了单宁酸对绵羊瘤胃微生物环境变化引起的瘤胃生物氢化作用的影响。将十三只羔羊（45天龄）分配给两种饮食疗法：七只羔羊饲喂基于大麦的浓缩物（对照组），而其他六只羔羊则接受相同的浓缩物，并添加了quebracho单宁（干物质的9.57％）。在122日龄时，将羔羊屠宰，对瘤胃内容物进行脂肪酸分析，并取样以定量纤维溶纤毛虫的数量，从而转化C_（18：2）c 9- c 12（亚油酸[LA]）到C_（18：2）c 9- t 11（瘤胃酸[RA]），然后RA到C_（18：1）t 11（vaccenic acid [VA]）;我们还取样了Butyrivibrio proteoclasticus，它将VA转换为C_（18：0）（硬脂酸[SA]）。与不含单宁的饮食相比，单宁在瘤胃中的VA增加（P <0.005）。 SA的浓度不受单宁的影响。单宁饲喂的羔羊的SA / VA比值较低（P <0.005），表明对照的BH过程的最后一步被单宁酸抑制。在饲喂单宁的羔羊瘤胃中，破破骨杆菌的种群较低（？30.6％; P <0.1），纤溶纤维杆菌和原生动物的种群较高（分别为+ 107％和+ 56.1％; P <0.05）。补充饮食比对照组。这些结果表明，quebracho丹宁酸通过改变瘤胃微生物种群来改变BH。

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