| 稀释率对于活体外瘤胃发酵和微生物生长效率的影响 |
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| 引用本文： | 孟庆翔,高仲元,Ｍ．Ｓ．Ｋｅｒｌｅｙ,Ｒ．Ｌ．Ｂｅｌｙｅａ.稀释率对于活体外瘤胃发酵和微生物生长效率的影响[J].动物营养学报,1999(1). |
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| 作者姓名： | 孟庆翔 高仲元 Ｍ．Ｓ．Ｋｅｒｌｅｙ Ｒ．Ｌ．Ｂｅｌｙｅａ |
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| 作者单位： | 中国农业大学动物科技学院，美国密苏里大学动物科学系 |
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| 摘 要： | 采用连续培养系统的４个发酵罐进行３次连续培养试验，研究瘤胃稀释率（ＤＲ，下同）对于瘤胃微生物发酵和微生物生长效率的影响。瘤胃稀释率为每小时发酵液流出量占发酵罐体积的０．０３和０．０６。试验日粮唯一由大豆皮组成。随着ＤＲ的提高，饲料ＤＭ，ＯＭ，ＣＰ，ＮＤＦ和ＡＤＦ消化率均没有显著变化（Ｐ＞０．０５）。提高瘤胃ＤＲ，显著提高了微生物发酵的ｐＨ（Ｐ＜０．０１），降低了发酵液中ＮＨ３的浓度（Ｐ＜０．０２），但对挥发性脂肪酸日产生量和乙、丙、丁酸比例没有显著影响（Ｐ＞０．０５）。发酵液中瘤胃细菌浓度不随ＤＲ变化而变化（Ｐ＞０．０５），但每日细菌总量随ＤＲ提高而提高（Ｐ＜０．０１）。发酵液原虫浓度（Ｐ＜０．００１）和原虫每日总产量（Ｐ＜０．０５）均随ＤＲ提高而下降。当ＤＲ从０．０３提高到０．０６时，微生物Ｎ日产生量和微生物生长效率分别提高４１．６％（Ｐ＜０．００１）和５１．９％（Ｐ＜０．００１）。
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| 关 键 词： | 连续培养 瘤胃发酵 稀释率 微生物生长效率 |
EFFECT OF DILUTION RATE ON MICROBIAL FERMENTATION AND GROWTH EFFICIENCY IN A SINGLE EFFLUENT CONTINUOUS CULTURE |
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| Meng Qingxiang,Gao Zhongyuan.EFFECT OF DILUTION RATE ON MICROBIAL FERMENTATION AND GROWTH EFFICIENCY IN A SINGLE EFFLUENT CONTINUOUS CULTURE[J].Acta Zoonutrimenta Sinica,1999(1). |
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| Authors: | Meng Qingxiang Gao Zhongyuan |
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| Abstract: | A study was conducted using a single effluent continuous culture system to investigate the effect of dilution rate (DR) on rumen microbial fermentation and microbial growth efficiency.Two DRs,0.03 and 0.06/h of fermenter volume,were used.As DR increased,there were no significant changes(P>0.05) in digestibilities of dry matter(DM), organic matter(OM),crude protein (CP),neutral and acid detergent fiber(NDF,ADF).Increasing DR from 0.03 to 0.06/h resulted in increased fermenter pH(P<0.01) and decreased ammonia concentration (P<0.02).Total VFA production and molar proportions of acetate,propionate and butyrate were not affected(P>0.05)by DR,suggesting that changes in DR within a proper range may not alter microbial fermentation pattern in the rumen.With increasing DR,there was no change in fermenter bacterial concentrations(P>0.10),whereas significant increases in daily bacterial production (P<0.01),and decreases in fermenter protozoal concentrations and daily protozoal production (P<0.05)were found.When DR increased form 0.03 to 0.06/h,daily microbial N production and microbial growth efficiency(grams of microbial N per kg of OM truly digested) were increased by 41.6%(P<0.001) and 51.9%(P<0.001),respectively. |
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| Keywords: | Continuous culture Rumen fermentation Dilution rate Rumen microbial growth effictency |
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