共查询到17条相似文献，搜索用时 203 毫秒
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为了分离鸡消化道中的乳酸菌,用BL和改良MRS培养基进行菌种分离,通过生化试验、乳酸纸层析等方法进行鉴定,结果自鸡嗉囊和盲肠中分离到产酸能力强的菌株8株,经鉴定为唾液乳杆菌、发酵乳杆菌和肠球菌为主.其中嗉囊中以唾液乳杆菌为主,盲肠中以发酵乳杆菌为主,其次是唾液乳杆菌和肠球菌. 相似文献
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为了分离鸡消化道中的乳酸菌,用BL和改良MRS培养基进行菌种分离,通过生化试验、乳酸纸层析等方法进行鉴定,结果自鸡嗉囊和盲肠中分离到产酸能力强的菌株8株,经鉴定为唾液乳杆菌、发酵乳杆菌和肠球菌为主。其中嗉囊中以唾液乳杆菌为主,盲肠中以发酵乳杆菌为主,其次是唾液乳杆菌和肠球菌。 相似文献
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为了研究鸡源鼠李糖乳杆菌对氨处理的效果,试验采用体外培养和体内饲喂的方法,将鼠李糖乳杆菌和唾液乳杆菌添加到以(NH_4)_2SO_4为唯一氮源的培养基和SPF鸡基础日粮中,测定培养基中氨离子浓度,粪中氨气排放量,血浆中氨、尿素氮、尿酸含量,盲肠中pH值和乳酸菌、肠球菌和大肠杆菌浓度。结果表明:鼠李糖乳杆菌和唾液乳杆菌均能显著降低氨离子浓度、氨气排放量、血氨浓度、盲肠pH值、肠球菌和大肠杆菌浓度(P0.05),显著提高盲肠乳酸菌浓度(P0.05);与唾液乳杆菌比较,鼠李糖乳杆菌能显著降低24,36小时氨离子浓度和氨气排放量(P0.05),显著提高盲肠乳酸菌浓度(P0.05)。说明鼠李糖乳杆菌的降氨效果优于唾液乳杆菌,是理想的降氨、除氨菌株。 相似文献
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为了取得比较理想的禽用微生态制剂菌种,用BL和乳酸杆菌选择性培养基从SPF鸡嗉囊和盲肠中分离乳酸菌,通过生化试验、乳酸纸层析等方法进行鉴定。结果,从SPF鸡嗉囊和盲肠中分离到产酸能力较强的细菌3株,经鉴定为2株乳酸杆菌(LactobaccillusPlanterum)、1株粪链球菌(Enterococcusfaecium)。 相似文献
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Evaluation in vitro of the antagonistic substances produced by Lactobacillus spp. isolated from chickens 
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下载免费PDF全文 Edna T. Lima Raphael L. Andreatti Filho Adriano S. Okamoto Jos C. Noujaim Mrcia R. Barros Adalberto J. Crocci 《Canadian journal of veterinary research》2007,71(2):103-107
To determine the inhibitory capacity of lactic acid bacteria due to the action of antagonistic substances, we tested 474 isolates of Lactobacillus from the crop and cecum of chickens against gram-positive and gram-negative indicator microorganisms by the spot-on-the-lawn and well-diffusion antagonism methods. Of the 474 isolates, 265 demonstrated antimicrobial activity against the indicator microorganisms. Isolates identified as L. reuteri, L. salivarius, or Lactobacillus spp. inhibited Enterococcus faecalis, E. faecium, Listeria monocytogenes, and Salmonella spp. but not L. casei, L. delbrueckii, L. fermentum, or L. helveticus by the well-diffusion simultaneous antagonism method under anaerobic incubation conditions. The antagonistic substances produced by some of the Lactobacillus isolates were inactivated after treatment by proteolytic enzymes, which suggested that the substances could be antimicrobial peptides or bacteriocins. 相似文献
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Three gut lactobacilli from piglets (Lactobacillus plantarum L 5, Lactobacillus paracasei L 81, Lactobacillus fermentum L 670) and Lactobacillus casei subsp. pseudoplantarum L.c.) from a calf were examined by microtitre plate binding assay for their lectin-like binding activity after their cultivation on Rogosa agar and in MRS broth. Three ECM (extracellular matrix) molecules (fetuin, porcine fibronectin and porcine mucin) were selected for this assay. Additionally, the effect of heparin on the binding of these three ECM molecules by Lactobacillus strains in microtitre plates was tested. Moreover, haemagglutination tests with pig, cattle, sheep, and hen erythrocytes were performed. However, none of the four Lactobacillus strains examined did react with any of the erythrocytes tested. The differences between individual strains were observed in their binding to immobilised ECM molecules. The best adherent was the Lactobacillus plantarum L5, however, the other three strains showed also good ECM binding. With regard to an influence of cultivation medium on lectin-like binding activity, binding of all ECM molecules was expressed in Lactobacillus paracasei L 81 to significantly higher degree (P < 0.001) after cultivation on Rogosa agar than in MRS broth. Similarly, strains Lactobacillus fermentum L 670 and Lactobacillus casei subsp. pseudoplantarum L.c. displayed significantly higher (P < 0.001) binding of fibronectin and mucin after growth on Rogosa agar in comparison with MRS broth cultivation. However, no significant (on fetuin and fibronectin binding) or opposite effect (on mucin binding) of cultivation medium was observed in Lactobacillus plantarum L 5 strain. The influence of cultivation medium on fetuin binding by Lactobacillus fermentum L 670 was also not significant while Lactobacillus casei subsp. pseudoplantarum L.c. bound fetuin significantly better (P < 0.01) after growth on Rogosa agar. Heparin pretreatment increased the binding of the ECM molecules by the Lactobacillus fermentum L 670 strain significantly (P < 0.001 or P < 0.05) with the exception of porcine fibronectin when the strain was cultivated in MRS broth. This result is important especially in the connection with the previous observations that heparin decreased ECM binding of enteropathogens as staphylococci or clinical enterococcal isolates. Following up on some earlier strain characteristics, these results indicate that the selected lactobacilli are probably suitable for probiotic purposes. 相似文献
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优良抑菌活性乳酸菌对玉米青贮及有氧暴露期微生物数量和pH的影响 总被引：1，自引：0，他引：1
为了探讨乳酸菌对全株玉米青贮及有氧暴露后青贮饲料中乳酸菌、好氧细菌、酵母菌和霉菌数量及其pH的影响,进一步筛选出可提高青贮饲料品质和有氧稳定性的乳酸菌接种剂,将实验室前期从甘肃各地玉米秸秆青贮饲料中分离筛选获得的5株产酸快、多且具有抑菌活性的优良乳酸菌分别添加全株玉米进行青贮,分析青贮过程和有氧暴露后青贮饲料中乳酸菌、好氧细菌、酵母菌和霉菌数量的动态变化及pH。结果显示,在青贮过程和有氧暴露后,分别添加肠膜明串珠菌肠膜亚种B1-7、戊糖片球菌B2-3、植物乳杆菌B3-1、屎肠球菌B5-2和发酵乳杆菌E2-3的各处理组乳酸菌总数均显著高于对照组,而好氧细菌、酵母菌和霉菌数量均显著低于对照组,pH亦低于对照组。其中B1-7和B5-2处理组在青贮初期乳酸菌总数最多,从青贮第7天开始到有氧暴露的30 d内,始终是B3-1处理组乳酸菌总数最多,好氧细菌、酵母菌和霉菌数量最少、pH最低。以上结果表明这5株乳酸菌具有提高青贮饲料品质和有氧稳定性的潜力,其中植物乳杆菌B3-1的效果最好。 相似文献
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Effects of erythromycin-inactivating Lactobacillus crop flora on blood levels of erythromycin given orally to chicks 总被引：2，自引：0，他引：2
Germ-free, day-old chickens were colonized with a Lactobacillus fermentum strain isolated from poultry which was able to inactivate in vitro erythromycin and other macrolide and lincosamide antibiotics. Similar control chickens were colonized with a non-degrading L. fermentum strain. Only in chickens colonized with the non-degrading strain were blood levels considered to be therapeutically active achieved with erythromycin in the drinking water. Five groups of broiler chickens of different age originating from three farms all possessed an erythromycin-degrading crop flora. In none of these were therapeutic blood levels attained when erythromycin was given in the drinking water. 相似文献
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发酵乳酸杆菌F6对鸡小肠上皮细胞β-防御素-9基因表达的影响 总被引：1，自引：0，他引：1
采用实时荧光定量PCR（fluorescence quantitative PCR,FQ-PCR）检测益生性发酵乳酸杆菌F6刺激鸡小肠上皮细胞后抗菌肽β-防御素-9（AvBD9）基因表达变化,为从益生菌与上皮细胞抗菌肽表达关系的新角度解析益生菌发挥益生作用的新途径和机制提供一定的基础及依据。利用不同剂量（2×105,2×106,2×107 CFU）的发酵乳酸杆菌F6分别刺激原代培养的鸡小肠上皮细胞4h,提取刺激后的细胞总RNA,反转录为cDNA,FQ-PCR检测抗菌肽AvBD9基因表达变化。结果表明,未受刺激的正常对照组也检测到AvBD9mRNA的表达,发酵乳酸杆菌F6能上调AvBD9基因表达。刺激组中AvBD9mRNA的表达在不同剂量组之间存在差异。2×105 CFU/mL组AvBD9mRNA的表达量极显著高于未受细菌刺激的对照组和2×106 CFU/mL组（P〈0.01）,显著高于2×107 CFU/mL组（P〈0.05）。2×106 CFU/mL组和2×107 CFU/mL组AvBD9mRNA的表达量显著高于未受细菌刺激的对照组（P〈0.05）,但2×106 CFU/mL组和2×107 CFU/mL组之间无显著差异（P〉0.05）。发酵乳杆菌F6与鸡小肠上皮细胞相互作用过程中可提高抗菌肽AvBD9mRNA的表达,且存在剂量依赖性。 相似文献
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A comparative analysis of caecum and crop microbiota of chick, grower and adult stages of Indian indigenous chickens was conducted to investigate the role of the microbiota of the gastrointestinal tract, which play an important role in host performance, health and immunity.
High-throughput Illumina sequencing was performed for V3, V4 and V4-V6 hypervariable regions of the 16S rRNA gene. M5RNA and M5NR databases under MG-RAST were used for metagenomic datasets annotation.
In the crop, Firmicutes (~78%) and Proteobacteria (~16%) were the predominant phyla whereas in the caecum, Firmicutes (~50%), Bacteroidetes (~29%) and Actinobacteria (~10%) were predominant. The Shannon-Wiener diversity index suggested that sample richness and diversity increased as the chicken aged.
For the first time, the presence of Lactobacillus species such as L. frumenti, L. antri, L. mucosae in the chicken crop along with Kineococcus radiotolerans, Desulfohalobium retbaense and L. jensenii in the caecum are reported. Many of these bacterial species have been found to be involved in immune response modulation and disease prevention in pigs and humans. The gut microbiome of the indigenous chicken was enriched with microbes having probiotic potential which might be essential for their adaptability.