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饲粮不同NFC/NDF对奶山羊瘤胃溶纤维丁酸弧菌、牛链球菌及埃氏巨型球菌含量变化的影响

DOI: 10.3969/j.issn.1006-267x.2011.10.011

Keywords: 饲粮NFC/NDF比,亚急性瘤胃酸中毒,实时定量PCR,瘤胃细菌

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Abstract:

本试验旨在探讨在饲粮不同非纤维性碳水化合物/中性洗涤纤维(NFC/NDF)条件下,奶山羊发生亚急性瘤胃酸中毒(subacuterumenacidosis,SARA)过程中瘤胃溶纤维丁酸弧菌、牛链球菌及埃氏巨型球菌数量的变化。选用6只安装有永久性瘤胃瘘管的泌乳期关中奶山羊为试验动物,采用动物自身前后对照法,试验分4期进行,每期10d,依次饲喂NFC/NDF比分别为1.02(Ⅰ期)、1.24(Ⅱ期)、1.63(Ⅲ期)、2.58(Ⅳ期)的4种饲粮,以逐渐增加饲粮精料含量的方式诱导奶山羊发生SARA,并采用实时定量PCR技术对瘤胃内溶纤维丁酸弧菌、牛链球菌及埃氏巨型球菌的数量变化进行定量分析。结果表明:1)随着饲粮NFC/NDF比的逐步升高,溶纤维丁酸弧菌和埃氏巨型球菌的数量均增加,但当饲粮NFC/NDF比升至2.58时,与其他试验期相比,埃氏巨型球菌的数量极显著增加(P<0.01),而溶纤维丁酸弧菌的数量却菜显著降低(P<0.01)。2)牛链球菌的数量随着饲粮NFC/NDF比的逐步增加呈显著下降(P<0.05),但到Ⅳ期又恢复到Ⅰ期数量。结果提示,当奶山羊发生SARA时,瘤胃牛链球菌的数量无明显变化,对低pH敏感的溶纤维丁酸弧菌数量急剧下降,而耐酸性的埃氏巨型球菌数量表现为大幅增加。

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