| 日粮碳水化合物结构对山羊瘤胃内环境参数及微生物组成的影响 |
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| 引用本文： | 李国祥,王梦芝,王洪荣,张洁.日粮碳水化合物结构对山羊瘤胃内环境参数及微生物组成的影响[J].中国畜牧杂志,2007,43(19):42-45. |
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| 作者姓名： | 李国祥 王梦芝 王洪荣 张洁 |
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| 作者单位： | 扬州大学动物科学与技术学院,江苏扬州,225009 |
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| 摘 要： | 试验以3头安装永久性瘤胃瘘管的山羊为试验动物,以纯淀粉和纤维素为底物,利用人工瘤胃体外培养法,通过产气量、纤维素的降解率、瘤胃液氨氮浓度,瘤胃液pH值,微生物蛋白含量这5个指标的测定,评价日粮碳水化合物结构(NSC/SC,淀粉∶纤维素)为100∶0、70∶30、50∶50、30∶70、0∶100的5种组合对瘤胃发酵及微生物蛋白产量的影响。结果表明:随着体外培养时间的延长,培养底物中的碳水化合物随着NSC水平的降低,累积产气量不断降低,瘤胃液pH值不断提高,原虫占瘤胃微生物的比重不断升高。在NSC/SC值为30∶70时,纤维素的降解率和微生物蛋白产量达最高。瘤胃液氨氮浓度随着底物中NSC水平的降低变化不显著,但在培养后2h各组的氨氮浓度都达到最大值,随后便随着培养时间的延长而逐渐降低。
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| 关 键 词： | 产气量 微生物蛋白 NH_3-N浓度 降解率 |
| 文章编号： | 0258-7033（2007）19-0042-04 |
| 修稿时间： | 2006-11-28 |
Effects of Dietary NSC/SC Ratio on Rumen Environmental Parameter and Microbial Biomass in Vitro |
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| LI Guo-xiang,WANG Meng-zhi,WANG Hong-rong,ZHANG Jie.Effects of Dietary NSC/SC Ratio on Rumen Environmental Parameter and Microbial Biomass in Vitro[J].Chinese Journal of Animal Science,2007,43(19):42-45. |
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| Authors: | LI Guo-xiang WANG Meng-zhi WANG Hong-rong ZHANG Jie |
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| Institution: | College of Animal Science and Technology, YangZhou University, Jiangsu Yangzhou, 225009, China |
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| Abstract: | Three goats fitted with rumen cannula were used to determine the effects of dietary NSC/SC ratio on the pH,NH3-N concentration,production of microbial protein,and cellulose degradability in the culture in vitro.The experimental results were described as follows:Gas production increased with NSC decreasing in the culture,while pH value and the proportion of protozoa increased gradually.Cellulose degradability and the yield of microbial protein were all highest when NSC/SC ratio in the culture was set to 30∶70.NH3-N concentrations were not notable difference with varied NSC level in the culture,but it was the highest in all NSC/SC ratios at 2 h after culture,and subsequently reduced with incubation time. |
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| Keywords: | gas production microbial protein NH_3-N concentration degradability |
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