The aim of the study was to characterize the Bacillus subtilis ATCC 6051a strain, in order to establish its probiotic utility in piglet nutrition. The strain was assayed morphologically, culturally, biochemically, for hemolytic activity and enzymatically (amylase and protease). The identification and analysis of the biochemical characteristics was performed by catalase assay, API 50 CHB Biomerieux strips, apiweb API 50 CHB V 4.0 soft (B. subtilis very good identification, 99.4% ID) and ABIS online. The hemolytic activity was assayed on blood agar medium. The growth activity of strain was evaluated in two ways: static incubation (30 C, 24 h, 1.36 x 10 8 CFU/ml) and under constant agitation (30 C, 24 h, 150 rpm, (1.6 x 10 9 CFU/ml). The strain is a Gram-positive and rodshaped bacteria, arranged in short chains or in small irregular pairs with ability to produce spores on nutrient medium. The endospores were central, paracentral and subterminal, which did not deform the vegetative cell. The strain growth was aerobic and was nonhemolytic. The enzymatic process was observed by appearance of distinct zones around strain colonies. In conclusion, the results suggested that the strain present probiotic traits and can be further assessed for other probiotic characters (resistance to pH 2.0, resistance to bile acids and salts, antibacterial activity, induction of local immune response etc.).
The objective of the study is to present and validate an original online Advanced Bacterial Identification Software, ABIS, by comparison to a commercially available, standardized identification system, API strips and apiweb™ bioMerieux software. Methods and results: presentation of ABIS online software, phenotypic bacterial identification of 16 reference strains and 123 wild isolates by ABIS and apiweb TM bioMerieux software and comparative analysis of results. Closed results were obtained (same taxa) for reference and wild strains of Enterobacteriaceae, Pasteurellaceae, Bacillaceae, Lactobacillaceae, Staphylococcaceae, Streptococcaceae, and other. Conclusions: Apiweb™ confirmed the results of ABIS, overall, average identification percent for ABIS being 91.8% and 90.4% for apiweb TM. ABIS online is a powerful tool for microbiology lab and the Encyclopedia connection provides essential information about the ecological significance, pathology and other features of the identified strains.
Objective: the isolation and phenotypically identification of a Gallibacterium anatis biovar haemolytica strain from a hen with hemorrhagic ooforitis; the antimicrobial susceptibility testing of this isolate. Methods and results: a strain of G. anatis biovar haemolytica, was isolated and phenotypic identified by morphological, cultural and biochemical characters examination, with API 20 E, API 20 NE, API STAPH, API ZYM tests and ABIS online software. The antimicrobial susceptibility of the isolate was performed using the standard disk diffusion method. Conclusions: a strain of G. anatis biovar haemolytica was isolated and phenotypically identified from a hen. From our knowledge, this is the first reporting in Romania of isolation and identification of G. anatis biovar haemolytica. The Gah IDSA 161 strain could be phenotypic identified only by ABIS on line software, Pasteurellaceae Database version, unifying the results of four API kits and other biochemical tests. The isolate showed a multi-drug resistant profile to tetracyclines (tetracycline, oxitetracycline, doxicyclin), floroquinolones (enrofloxacin, ciprofloxacin), ampicillin, trimethoprim, nalidixic acid, clindamycin, and it was susceptible to sulfonamide, sulfomethoxazole/trimethoprim, gentamicin, cephalothin, streptomycin, amoxicilin/clavulanic acid.
This article evaluated the effects of supplemental probiotic Bacillus subtilis (Bs) ATCC 6051a (1.6x109cfu/mL) in diets for weaned piglets on their performance and on the occurrence of diarrhoea. Sixty piglets, 30 ±3 days old with initial bodyweight of 8.41±0.92 kg, were allotted randomly to six pens of ten piglets. There were two replicates of each treatment, namely a control diet (C), a diet supplemented with 1% Bs (E1), and a diet supplemented with 3% Bs (E2). Feed was provided ad libitum as flour in two meals per day. Feed materials were examined for total numbers of fungi, aerobic mesophilic bacteria (TNG), Coliforms, Escherichia coli and Salmonella spp. The addition of Bs did not influence (P >0.05) bodyweight (BW) or average daily weight gain (ADWG). However, across the experimental period ADWG was greater in E2 and E1 than in C (>1.12 and 1.08 times compared with C). Feed intake (ADFI) by pigs fed C was greater than pigs fed E1 and E2. Feed efficiency was higher in E1 and E2 than the C diet. Addition of 1% Bs decreased (P<0.05) diarrhoea occurrence around 8% compared with C, and 4% compared with 3% Bs. A total of 23.4% of the piglets produced soft faeces. Diarrhoea scores of 2 (mild diarrhoea) and 3 (severe diarrhoea) were observed in 43.75% and 32.81% of the pigs. No differences (P >0.05) were detected between the treatments. The results suggested that E1 could positively affect growth performance and mitigate the occurrence of diarrhoea.
Chichens’s gastrointestinal (GI) tract presents a large bacterial diversity and can be a beneficial source in order to the isolation of probiotics candidates. In this study, twentythree strains from Lactobacillus genus (one strain of L. acidophilus biotype 1, eight strains of L. acidophilus biotype 3, one of L. crispatus, five of L. fermentum biotype 1, two of L. brevis biotype 2, five of L. salivarius and one strain of L. delbrueckii subsp. delbrueckii) were isolated, cultured, and conserved from ileum and cecum digesta of sixteen chickens, 26 days old, based on their phenotypic characters. The strains confirmation was done by apiwebTM API 50 CHL V.5.1, BioMerieux (France) software, and ABIS online soft. The Lactobacillus strains (106 -108 CFU/g intestinal content) level in the selective medium were determined. The growth of Lactobacillus strains conserved at 4°C (from 48 days to 7 months) and room temperature (from 48 to 90 days) was evaluated. This study showed that chickens can be a stable source for isolating possibly active probiotic lactic acid bacteria (LAB). From Lactobacillus strains isolated and identified, respectively L. fermentum biotype 1 and L. brevis biotype 2 are theoretically suitable for continual testing of probiotic properties.
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