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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Relationship Between Rumen Ammonia Levels and the Microbial Population and Volatile Fatty Acid Proportions in Faunated and Defaunated Sheep
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Relationship Between Rumen Ammonia Levels and the Microbial Population and Volatile Fatty Acid Proportions in Faunated and Defaunated Sheep

机译：断羊和断羊羊瘤胃氨水平与微生物种群和挥发性脂肪酸比例的关系

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摘要

Cheviot wethers were defaunated by using dioctyl sodium sulfosuccinate and were constantly infused with urea to provide 2.87% of the daily N intake. Defaunation resulted in higher rumen dry matter and lower rumen pH. The molar per cent propionate was higher in defaunated sheep, whereas the molar per cent butyrate and acetate was lower. Apparent nitrogen digestibility, nitrogen utilization, and nitrogen balance were higher in defaunated sheep when compared with faunated animals. Urea infusion resulted in lower apparent nitrogen digestibility, nitrogen utilization, and nitrogen balance in faunated sheep, but did not affect nitrogen metabolism in defaunated sheep. Rumen ammonia-N levels in defaunated sheep were lower than those observed for faunated animals, and urea infusion into faunated sheep increased rumen ammonia-N levels to a greater extent than did the urea infusion into defaunated animals. Significant correlations were demonstrated between rumen ammonia-N levels and C2/C3, C3/C4 and C2/C4 volatile acid ratios. From this it was concluded that, as rumen ammonia-N levels increased, there was a shift from propionate to higher proportions of butyrate and acetate.
机译：通过使用磺基琥珀酸二辛酯钠使雪佛兰用的微滴剂消弱，并不断注入尿素以提供每日N摄入量的2.7％。脱胶导致较高的瘤胃干物质和较低的瘤胃pH。在被破坏的绵羊中，丙酸酯的摩尔百分数较高，而丁酸酯和乙酸盐的摩尔百分数较低。与带动物的动物相比，退化羊的表观氮消化率，氮利用率和氮平衡更高。尿素注入会降低动物群绵羊的表观氮消化率，氮利用率和氮平衡，但不会影响被淘汰的绵羊的氮代谢。灭活绵羊的瘤胃中氨氮水平低于动物群观察到的动物水平，而向动物群化绵羊中注入尿素的瘤胃中氨氮水平要比向灭绝动物中注入尿素的程度更大。瘤胃氨氮水平与C2 / C3，C3 / C4和C2 / C4挥发性酸比率之间显示出显着的相关性。由此得出的结论是，随着瘤胃中氨氮含量的增加，丁酸酯和乙酸酯的比例从丙酸酯向更高比例转变。

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