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植物乳杆菌A6(lactobacillus plantarum A6)生物学特性及在发酵饲料中应用的研究
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摘要
本研究主要对植物乳杆菌A6生物学特性、植物乳杆菌A6发酵饲料最佳发酵条件的筛选以及发酵饲料在断奶仔猪中的应用方面进行研究。主要研究结果如下:
     试验一:通过对植物乳杆菌A6高温高压耐受性、直接将淀粉分解成乳酸能力等方面的研究,结果表明植物乳杆菌A6具备耐受80℃、0.20Kg/cm~2蒸汽压力的能力、直接将淀粉分解成乳酸的能力等特性。
     试验二、选用正交表L_(16)(4~5)来安排正交试验,筛选出植物乳杆菌A6发酵断奶仔猪料的最佳发酵时间、接种量、发酵温度、pH值和湿度。五因素对乳酸产率的影响次序依次为:接种量>温度>湿度>时间>pH;最佳发酵条件为:接种量10%,温度37℃,湿度65%,时间48h,pH值6.5。
     试验三:通过断奶仔猪的饲养试验和消化试验来评定植物乳杆菌A6发酵断奶仔猪料对断奶仔猪的营养价值。试验结果表明植物乳杆菌A6发酵断奶仔猪料能显著提高断奶仔猪的试验末重(P<0.05),比对照组提高了13.85%(P<0.05);能显著提高断奶仔猪血清总蛋白含量和显著降低血清尿素氮含量,血清总蛋白比对照组提高了16.31%(P<0.05),而血清尿素氮比对照组降低了36.21%(P<0.05):有提高断奶仔猪细胞免疫水平的趋势,试验组CD_4+比对照组高22.22%,试验组CD_4+/CD_8+
    
    厂西大学硕士学位论文
    植物乳杆菌A6( Lac,obacilloPlaolar二A6)生物学特性及在发酵饲料中应用的研究
     比对照组高16.95%;能在一定程度上改善肠道微生物环境的趋势,试
     验组同对照组相比,空肠、盲肠乳酸菌数量分别提高了9.65%、18.11%,
     空肠、盲肠大肠杆菌数量分别降低了9.26%、1 2.32%,空肠、盲肠沙门
     氏菌数量分别降低了5.93%、17.58%;对小肠绒毛长度有提高的趋势,
     比对照组高44.36%,对胃底腺胃小凹的深度有加深的趋势,比对照组
     深17.74%。饲料发酵后,粗蛋白和真蛋白含量有提高的趋势,分别比
     对照组提高了19.29%、7.94%;粗蛋白和钙表观消化率也有提高趋势,
     分别比对照组提高了4.54%、12.82%。
Three experiments were conducted to investigate Lactobacillus plantarum A6's biology character, selection of optimal fermentation condition and application on fermented feed of weaning piglets.
    Experiment 1 studied the tolerance of Lactobacillus .plantarum A6 to high temperature and high pressure, and its ability of decomposing starch into lactic acid, the results showed that Lactobacillus plantarum A6 has the ability of enduring the temperature of 80℃ and the steam pressure of 0.20Kg/cm2.
    Experiment 2 was designed with L16 (45) of the orthogonal table. The best fomentation time, pitching rate, fermentation temperature, fermentation pH value and fermentation humidity were selected from the weaning piglet s feed fermented by Lactobacillus plantarum A6. The sequence influenced by the five factors was the pitching rate, the temperature, the humidity, the time
    
    
    and the pH in order. The best condition was that the pitching rate, the temperature, the humidity, the time and the pH were 10%, 37癈, 65%, 48h
    and 6.5, respectively.
    Experiment 3, the feeding experiment and the digestion trial were conducted with weaning piglets, which evaluated the nutritional value of Lactobacillus plantarum A6's fermented feed. Compared with the control group, the final weight and the serum total protein in the trial group were significantly improved by 13.85%(P<0.05)and 16.31%(P<0.05), respectively; but the serum urea nitrogen decreased by 36.21%(P<0.05). The trial group had the tendency of improving the cell immunity level, the CD4+ and CD4+/CD8+ were improved by 22.22% and 16.95%, respectively. The lactic acid bacteria contents of the jejunum and the cecum in the trial group were improved by 9.65% and 18.11%, but the E.coli contents of the jejunum and the cecum decreasd by 9.26% and 12.32%, the Salmonella contents of the jejunum and the cecum decreasd by 5.93% and 17.58%; the villus length in the small intestine raised by 44.36%, while the gastric pits altitude in the fundic gland improved by 17. 74%. After fermentation, the crude and true protein
    contents improved by 19.29% and 7.94%; the crude protein and calcium apparent digestibility improved by 4.54% and 12.82%.
引文
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