Antagonistic activity of the lactic bacteria

BACKGROUND: A microbial imbalance in the vaginal biotope leads to the development of vaginal infections and is associated with urinary tract infections. The ineffectiveness of the therapy and the frequent recurrence of these infections are important reasons for searching for alternative treatment strategies. A progressive solution to this issue has been the use of oral probiotics with a targeted effect on the intestinal and vaginal microflora. AIM: The aim of this study was to evaluate the antagonistic and antibacterial activity of the probiotic strains Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14, which are the components of the oral probiotic, against opportunistic microorganisms of intestinal origin, while assessing the sensitivity of these strains to antimicrobial drugs. MATERIALS AND METHODS: The probiotic strains Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14 included in the oral probiotic Duogynal® were cultivated and the grown colonies were identified using the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry method (Bruker Daltonics GmbH Co., Germany). To study the antagonism of the probiotic strains of lactobacilli and opportunistic pathogenic microorganisms, the following 11 clinical isolates were collected: Escherichia coli (two isolates), Klebsiella pneumoniae, Klebsiella oxytoca, Enterobacter asburiae, Proteus mirabilis, Citrobacter freundii, Staphylococcus aureus, Enterococcus faecalis, Streptococcus agalactiae, and Candida albicans. To assess the sensitivity of the probiotic strains to antimicrobial drugs, the Gram Positive AST panel (Autobio Diagnostics Co., Ltd, China) was used. RESULTS: When the microorganisms were co-cultivated with the probiotic lactobacilli (Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14), we noted a decrease in pH and the death of opportunistic microorganisms such as Escherichia coli, Klebsiella pneumoniae, Klebsiella oxytoca, Enterobacter asburiae, Proteus mirabilis, Citrobacter freundii, Staphylococcus aureus, Enterococcus faecalis, and Streptococcus agalactiae, as well as yeast-like fungi Candida albicans. When studying antibiotic resistance, it was found that the both strains of lactobacilli were resistant to ampicillin, vancomycin, daptomycin, clindamycin, linezolid, moxifloxacin, nitrofurantoin, oxacillin, oritavancin, penicillin, rifampin, teicoplanin, tigecycline, trimethoprim/sulfamethoxazole, cefoxitin, ceftarolin, and ciprofloxacin. CONCLUSIONS: The oral probiotic, which contains a combination of two lactobacilli (Lactobacillus rhamnosus HN001 and Lactobacillus acidophilus La-14), has pronounced antagonistic activity against opportunistic microorganisms. These strains are resistant to most antibacterial drugs used in widespread clinical practice, which may be the basis for recommending the use of this probiotic drug together with prescribed antibiotics for prevention of vaginal or intestinal dysbiosis.

Nomad livestock farming is an extra raw material resource for regions with harsh climate. Foods based on meat of indigenous animals expand the range of products with high consumer properties. The quality and safety of meat products usually depend on the brine. The present research featured the effect of brine with Island moss (Cetrária islándica (L.) Ach.) on the sensory profile and microbiological safety of meat products. The study involved meat of two-year-old indigenous cows, as well as multicomponent antibacterial and standard extrusion brines. The brine was injected with a syringe-injector with a hollow perforated needle at a 20 mm pitch. The tenderization took place in a universal express tenderizer with a rotation speed of 16 rpm and lasted for 10 h. The shelf-life was determined based the on microbiological, chemical, and sensory indicators. By the end of the reserve shelf-life, the total microbial count was 1.2×103 CFU/g in the control and 1.0×103 CFU/g in the experimental sample. No opportunistic pathogenic bacteria or microorganisms were detected. No opportunistic pathogenic microorganisms were revealed when the microbiological parameters were studied in standard quantities and in quantities increased by an order of magnitude. The changes in acid and peroxide numbers during storage indicated a stable oxidation of the fat component in the experimental sample. Its sensory evaluation exceeded the control sample by 0.9 points in terms color, texture, and smell. The meat marinated with C. islándica compiled with the quality standard and had a shelf-life which exceeded that of the traditionally-marinated meat by 5 days.

The use of bacterial starters for the production of fermented foods has several advantages over traditional spontaneous fermentation, as it provides a rapid and controlled decrease of pH, improves the microbiological quality of the product, and prolongs the shelf-life. Fermented foods are typically produced using mixed cultures of lactic acid bacteria (LAB) due to the synergism between their constituent bacterial cultures. So, the compatibility of the LAB strains decides the efficacy of a multi-strain starter. The purpose of this study was to investigate the effect of the cocultivation of Lactobacillus plantarum strains on the growth, acidification, and antagonistic activity to determine suitable strain combinations for fermented vegetable production. Methods. The effect of cocultivation on growth characteristics of four L. plantarum strains was determined in MRS medium and cabbage-based medium with 2.5% NaCl. After 8 h of cultivation at 30°C and 37°C, the number of viable cells (CFU/ml) and the pH of the medium were determined. The antagonistic activity of monocultures of L. plantarum and their six compositions against opportunistic pathogenic microorganisms was determined by the method of delayed antagonism. Results. During growth in MRS broth at 30°C cocultivation of L. plantarum 47SM with L. plantarum 691T or L. plantarum 1047K strains led to enhanced rates of growth compared to the monocultures, suggesting some degree of symbiosis between these strains. Viable cell counts of L. plantarum 47SM, 1047K and 691T strains and ΔpH values of L. plantarum 952K, 1047K, and 691T strains were higher after 8 h growth in the cabbage-based medium at 30°C compared to MRS broth. Despite the intensive growth of L. plantarum monocultures in cabbage-based medium, a significant decrease of viable cell counts and ΔpH values during cocultivation at 30°C were found. Cocultivation did not affect the average size of the growth inhibition zones of most of the indicator strains used. However, growth inhibition zones of Shigella flexneri, Escherichia coli, and Proteus vulgaris decreased in some L. plantarum mixed cultures compared to monocultures. Thus, the growth inhibition zones of E. coli and S. flexneri by mixed culture L. plantarum 47 SM+1047K were significantly smaller compared to the growth inhibition zones of L. plantarum monocultures. Conclusions. Thus, based on the data obtained in present work, we can assume that some of these L. plantarum strains used in the work may be bactericinogenic. Although the four L. plantarum strains studied are compatible when cocultivated in a standard rich MRS medium, the results of cocultivation in a cabbage-based medium with 2.5% NaCl does not allow to recommend the use of these L. plantarum strains simultaneously in the starter for vegetable fermentation. Further investigation of bacteriocinogenic properties and mechanisms of growth inhibition under cocultivation in vegetable-like conditions are needed, which will allow combining of some of these L. plantarum strains with LAB strains of other species or genera to create multi-starters for vegetable fermentation.

ВПЛИВ ПРОБІОТИЧНОГО ПРЕПЕРАТУ БІОСПОРИНУ НА МІКРОБІОТУ КИШКИ ЗДОРОВОГО ОРГАНІЗМУ В ЕКСПЕРИМЕНТІ

Objective: Studying the antagonistic activity of cultures of lactic acid bacteria strains bred at the Research Institute of Biotechnology of the Gorsky State Agrarian University compared to some representatives of pathogenic and conditionally pathogenic microflora: Staphylococcus aureus, Escherichia coli, and Proteus vulgaris. Materials and Methods: In studying the antagonistic activity of lactic acid bacteria, studies were performed with the use of the following methods of analysis generally accepted in microbiology: The method of serial dilutions in liquid nutrient medium and the method of diffusion in agar with the use of agar nutrient medium (1, 5). The material for the study was pure cultures of microorganisms’ breeding strains bred at the Research Institute of Biotechnology of the Gorsky State Agricultural University: Streptococcus salivarius RNCIM V-11174, Lactobacillus helveticus RNCIM V-11175, L. helveticus RNCIM V-11176, and S. salivarius RNCIM V-11177. Results: The article shows the data obtained in the study of antagonistic properties of lactic acid bacteria strains bred by the Research Institute of Biotechnology of the Gorsky State Agricultural University: S. salivarius RNCIM V-11174, L. helveticus RNCIM V-11175, L. helveticus RNCIM V-11176, and S. salivarius RNCIM V-11177 deposited in the All-Russian collection of industrial microorganisms of the FSUE GosNIIGenetika for S. aureus, E. coli, and P. vulgaris. It has been determined that the studied strains of lactic acid bacteria included into the starter cultures for obtaining probiotic food products contain high number of living cells of lactic acid bacteria - up to 1010 CFU/cm3 and are antagonistically active to pathogenic and conditionally pathogenic microflora. The results of the research confirm the feasibility of using pure cultures of lactic acid microorganisms bred at the Research Institute of Biotechnology of the Gorsky State Agricultural University for the preparation of bacterial starter cultures of lactic acid microorganisms due to their physiological, biochemical, and antagonistic activity. Conclusion: The results prove the feasibility of using the studied strains of lactic acid bacteria in preparing starter cultures for the production of functional probiotic products based on their high physiological, biochemical, and antagonistic activity to pathogenic and conditionally pathogenic bacteria. The studied cultures of lactic acid bacteria strains have various abilities to suppress the growth of pathogenic and conditionally pathogenic microorganisms, which should be considered in choosing lactic bacteria for preparing starter cultures and producing probiotic dairy products and functional food products.

Fermenting microflora has been selected by biotechnological activity markers, with various methodological approaches used, namely: directional selection, selection of bacteriophage-insensitive mutants, protoplast regeneration. The experimental data show a significant biotechnological potential of the selected lactic acid bacteria. They are characterized by high milk-clotting activity and yield, the ability to form aromatic compounds and/or viscous components, excellent organoleptic qualities of clots fermented by them, antago-nistic activity against pathogenic and opportunistic pathogenic microorganisms, and phage-resistance to species-specific virulent phages. The collection of industrial microorganisms of Institute of Food Resources of National Academy of Agrarian Sciences (IFR NAAS) has been supplemented with new bioactive strains, in particular, the species Streptococcus thermophilus, Lactobacillus acidophilus, Lactoba-cillus rhamnosus and Lactococcus lactis. Four bacterial compositions have been created. Three of them (Iprovit-LB-R; Iprovit-LB-A, and Iprovit-ST) are supposed to be used as functional enrichers for dry foodstuffs or as biologically active supplements. The bacterial prepara-tion Iprovit-Bifidolux is a universal composition. It can be introduced both as a fermenting culture for milk fermentation and as an enricher for dry and liquid foodstuffs. Biotechnologies for the production of dry bacterial preparations on the basis of selected strains have been field-proven at the State Research Enterprise of Starter Cultures that belongs to the IFR NAAS. The data on a wide range of clinical and therapeutic effects of the bacterial preparation Iprovit-Bifidolux allow recommending it for manufacturing functional foods.

Antimicrobial activity of Mentha piperita essential oil in combination with silver ions

A promising area for improving probiotics is the search for new sources of strains and the development of complex preparations which would include different types of bacterial cultures that complement each other. Sources of selection may be traditional dairy products, in particular, cheeses made from raw milk. Wild strains can be endowed with antibacterial properties. The antagonistic action of lactic acid bacteria (LAB) has long attracted the attention of researchers and scientists. The aim of the study was to investigate the antagonistic activity against pathogenic and opportunistic microorganisms of LAB strains isolated from traditional Carpathian cheese. Three samples of cheese were selected for the research – one sample of brynza and budz (brynza before salting), made in the highlands of the Carpathians, and one sample of budz, made in the foothills. LAB were identified using classic microbiological and modern molecular genetic methods (RAPD-PCR, RFLP-PCR, 16S rRNA gene sequencing). The objects of our studies were five strains of LAB: Lactococcus lactis IMAU32258, L. garvieae JB2826472, Enterococcus durans FMA8, E. faecium L3-23, E. faecium IMAU9421. Technological parameters such as acid-forming activity of milk fermentation, resistance to high concentrations of NaCl and temperature optimums of cultivation were taken as the main criteria for assessing the suitability of LAB for inclusion in fermentation preparations. Antagonistic activity was determined by agar diffusion (agar well method) and optic density of test cultures using a Multiscan FC microplate reader (Thermo scientifiс, USA) at the wave of 620 nm. There were four reference strains of pathogenic and opportunistic microorganisms were test cultures: Listeria monocytogenes PCM 2191, Staphylococcus aureus PCM 458, Escherichia coli PCM 2208, Salmonella typhimurium PCM 2182. Strains of the test cultures were received from the collection of microorganisms of the Institute of Biology and Biotechnology the (University of Rzeszów, Poland). According to the ability of LAB strains to form lactic acid, L. lactis IMAU32258 was the best acid-forming agent with an acid-forming energy of 94 °T. E. faecium was characterized by moderate levels of active and titratable acidity. Less pronounced acid-forming ability was determined for the species E. durans and L. garvieae. Cultures of the genus E. faecium, L. garvieae and E. durans were the most resistant to high concentrations of NaCl (6.5%). Regarding temperature optimums, we found that strains of E. faecium and E. durans species grew both at temperatures of 10, 15 and 45 °C, whereas no growth of L. lactis IMAU32258 and L. garvieae JB282647 2 was observed at 45 °C. Among the studied bacteria, the strains of E. durans FMA8 and E. faecium L3-23 were characterized by the highest antagonistic activity in producing the largest zones of growth inhibition and optic density of pathogenic and opportunistic microorganisms. The strain L. garvieae JB282647 2 exhibited the lowest level of antagonistic activity against pathogenic and opportunistic microorganisms.

Objective: The present study reported the isolation of lactic acid bacteria from the shrimp gastrointestinal tract and evaluation of its antagonistic activity against pathogenic bacteria. Methods/ statistical analysis: Lactic bacteria from the gastrointestinal tract of alive healthy shrimp were screened on sterilized MRS medium. Vibrio sp. inhibition by isolates was conducted by the agar-well diffusion assay. The isolates were identified by 16S rRNA sequencing. Antibacterial activity was investigated against 25 Vibrio sp. isolates, Staphylococcus aureus ATCC 25023, and Escherichia coli ATCC 85922. Hemolytic activity, salt, and antibiotic resistance were also evaluated. Findings: Total of 22 isolates exhibited Vibrio parahaemolyticus inhibition with antagonistic activities ranged from 220 AU/ml to 460 AU/ml. Sequence analysis of 16S rRNA indicated the 5 isolates belong to Weissella cibaria species, namely HN02, HN03, HN04, and HN06 AND HN07. Among these, W. cibaria HN05 had highest antagonistic activity and exhibited the broad inhibition spectrum against Vibrio sp. as well as E. coli ATCC 85922 but not S. aureus ATCC 25023. β-hemolytic and salt resistance assays showed that W. cibaria HN05 had no β-hemolytic activity and grew well in medium containing 5% of salt. Antibiotic resistance analysis indicated W. cibaria HN05 was suppressed by ampicillin, chloramphenicol, oxytetracycline hydrochloride, and chlortetracycline hydrochloride. Application/improvements: This is the first study on isolation and evaluation pathogenic bacteria including Vibrio sp. inhibition by W. cibaria, which is isolated from shrimp gastrointestinal tract. Keywords: Antagonistic Activity, Gastrointestinal Tract, Shirmp, Weissella cibaria, Vibrio sp.

Aim. To study the phagocytic reaction indices in chickens-broilers of different age groups in case of organ and tissue contamination with opportunistic pathogenic microorganisms (OPM). Materials and methods. The object of the study - 210 chickens-broilers at the age of 1 day, 1, 2, 3, 4, 5, 6 weeks, which were kept in conditions of battery farm “Permskaya”. Chickens were divided into 3 groups: group I - clinically healthy, group II - without any clinical signs of disease, but OPM infected, group III - weakened poultry with massive OPM sowing from the internal organs. Presence of OPM and their organs and tissues was assessed with generally accepted microbiological methods. Phagocytic activity of blood pseudoeosinophiles and monocytes in relation to gram-positive test-microbe St. aureus was studied. Phagocytosis percent (PP), phagocytic number (PN), phagocytic index (PI) and phagocytic activity index (PAI) were determined. Results. In healthy chickens, high PAI level at early terms of their life was detected. Beginning from the second week and till the end of their growing, all blood cell phagocytic activity indices were reliably increasing. Continuous, stable, but less high growth of these indices in all age groups was observed also in clinically healthy, but OPM infected birds. Sick chickens had sharp fluctuations in PP, PI, PN and PAI during all the observed period that proves the reduced functional activity of phagocytes with regard to inactivation of microorganisms. Conclusions. High level of blood cell absorbing activity associated with growth of the share of “true” phagocytes in the group of healthy chickens-broilers shows strengthened with age ability of the body to eliminate antigens, particularly, opportunistic pathogenic ones. Growing with age, but lower ability of blood cells to phagocytosis is noted in the group of clinically healthy, but OPM infected poultry. One of the main reasons for development of generalized infectious process in sick poultry is an essential disturbance of natural resistance of the body revealed already in the first days of their life (by phagocytic reaction data)

Currently, the current method of correction and maintenance of the balance of intestinal microflora of birds is the use of probiotics - biopreparations created on the basis of live microbial cultures. Of particular interest for the prevention of gastrointestinal diseases of birds are probiotics based on lactobacilli with high antagonistic ability, which determines their practical application in poultry farming. The introduction of probiotics into the diet of birds from the first days of life stabilizes the microflora of the gastrointestinal tract and improves physiological processes, which contributes to increased safety and increased productivity of birds. The article presents data from a comparative study of the antagonistic activity of the probiotic biocomplex "AVIBIOLAKT" and individual cultures of lactobacilli included in this biopreparation - Lactobacillus acidophilus, Lactococcus lactis, Lactococcus cremoris. Isolates of pathogenic and opportunistic microorganisms from the collection of the Museum of Working Cultures of the Bacteriology Department of the All-Russian Research Institute of Vitiligo and Infectious Diseases were used as test cultures: Escherichia coli, Salmonella enteritidis, Staphylococcus aureus, Pseudomonas aeruginosa. The present studies have confirmed the antagonistic efficiency of the biocomplex "AVIBIOLAKT" in relation to opportunistic and pathogenic test microorganisms. The probiotic biocomplex "AVIBIOLAKT" had the highest antagonistic activity in relation to test microorganisms. It formed a growth inhibition zone from 16.4 to 19.6 mm depending on the test strain. Thus, the growth inhibition zone of Staphylococcus aureus was 19.6 mm, Escherichia coli and Salmonella enteritidis - 19.3 and 18.8 mm, respectively, and Pseudomonas aeruginosa - 16.1 mm. It was established that the level of antimicrobial activity against test microorganisms - Escherichia coli, Salmonella enteritidis, Staphylococcus aureus, Pseudomonas aeruginosa. was expressed to a greater extent in the biocomplex "AVIBIOLAKT". In individual cultures of lactobacilli of the studied probiotic biocomplex, the antagonistic ability was less pronounced. Lactobacillus acidophilus had the greatest antagonistic activity among individual cultures of lactobacilli.

Bacteria and fungi are ubiquitous in the near-surface atmosphere where they may impact on the surrounding environment and human health, especially in coastal megacities. However, the diversity, composition, and seasonal variations of these airborne microbes remain limited. This study investigated the airborne microbes of the near-surface atmosphere in coastal megacity Qingdao over one year. It was found that the sample in summer displayed the highest bacterial and fungal diversity, while sample in winter exhibited the lowest bacterial and fungal diversity. Proteobacteria was the dominating bacteria, and Dothideomycetes was the most dominating fungi in the near-surface atmosphere, which took up 53–76 and 49–78% relative abundance, respectively. However, the bacterial diversity and community composition had significant seasonal variations. These data suggest that a complex set of environmental factors, including landscaping ratio, solar radiation temperature, and marine microorganisms, can affect the composition of airborne microbes in the near-surface atmosphere in coastal megacity. The analysis of the pathogenic microorganisms or opportunistic pathogenic microorganisms existed in the near-surface atmosphere revealed that the relative abundance of pathogenic microorganisms in autumn was the highest. The main pathogenic microorganisms or opportunistic pathogenic microorganisms were Acinetobacter baumannii (accounting for up to 9.93% relative abundance), Staphylococcus epidermidis (accounting for up to 11.26% relative abundance), Mycobacterium smegmatis (accounting for up to 3.68% relative abundance), Xanthomonas oryzae pv. oryzae (accounting for up to 5.36% relative abundance), which may be related to certain human or plant diseases in specific environments or at certain seasons. Therefore, the investigation of airborne microbial communities of near-surface atmosphere in coastal megacities is very important to both the understanding of airborne microbes and public health.

In order to give the product functional properties, promising for the industry strains of cultures of lactic acid bacteria L. lactis ssp. lactis IMAU 32258, Lb. plantarum KLDS 1.0728 and E. durans SB18, isolated from traditional Carpathian bryndza. It was found that under conditions of co-cultivation, the studied strains were compatible, ie did not show interspecific antagonism. Based on these probiotic strains, five compositions of L. lactis ssp. lactis IMAU 32258, Lb. plantarum KLDS 1.0728 and E. durans SB18 in the ratios,%: composition № 1 – 50:25:25; № 2 – 33:33:33; № 3 – 50:40:10; № 4 – 50:10:40 and № 5 – 70:15:15 respectively. When determining the rate of biomass accumulation, it was found that at a temperature of 32 ° C the highest growth intensity was registered in the cultivation of compositions № 1, № 2 and № 4, it exceeded the control by 19.5–20.1 times (P <0.001). At a temperature of 37 °C for 24 h, the highest change in the optical density of the nutrient medium was found in the cultivation of compositions № 1, № 2 and № 3, in particular, it increased, respectively, in 17.9, 17.8 and 18.1 (P < 0.001) times compared to control. When determining the ability of different compositions of the consortium of lactic acid bacteria to reduce the pH of the medium, it was found that for 24 h of cultivation at 32 ° C the best acid-forming properties showed compositions № 3, № 4 and № 5 because they reduced the pH of the medium by 32.8, 33.3 and 32.8 %, respectively, to 4.87–4.91 units. At a temperature of 37 °C formed by us compositions were able to reduce the pH of the medium to 5.03-5.12 units, while the best acid-forming properties showed compositions № 1, № 3 and № 5. In determining the antagonistic properties of the studied compositions of microorganisms when cultured at temperature 32 °C was found to have moderate antagonistic activity against Escherichia coli, Enterobacter aerogenes, Proteus mirabilis, Salmonella enteritidis, Staphylococcus aureus and Pseudomonas aeruginosa, ie against all cultures of pathogenic and opportunistic microorganisms. Compared with other compositions, composition № 3 showed the highest antagonistic activity against Staphylococcus aureus, as well as quite high against Salmonella enteritidis, Pseudomonas aeruginosa and Enterobacter aerogenes. When culturing the studied compositions of a consortium of microorganisms at a temperature of 37 °C, all compositions showed moderate antagonistic activity against all test cultures of pathogenic and opportunistic microorganisms. Composition № 3 showed slightly higher antagonistic activity against Staphylococcus aureus, Salmonella enteritidis, Enterobacter aerogenes, as well as at a temperature of 32 °C, as well as against Pseudomonas aeruginosa. Therefore, isolated from traditional Carpathian cheese L. lactis ssp. lactis IMAU 32258, Lb. plantarum KLDS 1.0728 and E. durans SB18 have a high degree of biocompatibility and are suitable in different ratios for use in one composition, as indicated by the ability to accumulate biomass, lower pH and antagonistic activity to pathogenic and opportunistic microflora.

Feeding broiler chickens a probiotic biopreparation containing bacteria of the genus Bacillus subtilis and Bacillus licheniformis leads to improved feed digestion, increased productivity, and immune status, as well as reduced insemination by opportunistic and pathogenic microorganisms of slaughter products. It enhances the level of prevention and treatment of various poultry diseases. The purpose of the work is to carry out a microbiological analysis of the slaughter products of broiler chickens after drinking the probiotic biological preparation “Subtiform” in doses of 0.5 g, 2.0, and 4.0 g per 10 dm3 of water. The material (major pectoral muscle and internal organs) was examined by bacteriological methods. It was established that the content of MAFAM in the control and experimental groups 1, 2, and 3 of the chilled slaughter products of broiler chickens for 1, 3, and 5 days of storage at a temperature of 0–4 °С was within the limits of standards (no more than 1.0×104 CFU/d). It was established that when broiler chickens were given 4.0 g/10 dm3 of water, the MAFAM content for one day of poultry meat storage decreased by 10.4 % (Р < 0.05); on the third day of storage, it decreased by 9.6 % (Р < 0.05); at the beginning of the fifth day of storage, the decrease was, respectively, by 11.3 % (Р < 0.01) compared to the indicators of the control group. The content of MAFAM in offal, in particular in the heart of broiler chickens, was reduced in experimental group 3 by 36.9 % (Р < 0.001); in the liver – by 33.6% (Р < 0.001); in the muscular part of the stomach – by 27.2 % (Р < 0.001); in the spleen and lungs, there was also a decrease in the content of MAFAM in experimental group 3, respectively, by 20.2 % (Р < 0.01) and 23.6 % (Р < 0.01) compared to the indicators of the control group of broiler chickens. It was established that opportunistic pathogenic microorganisms, in particular BGCP, bacteria of the genus Proteus, and pathogenic microorganisms, in specific bacteria of the genus Salmonella, bacteria of the species Staphylococcus aureus, Listeria monocytogenes in 25 grams of the large pectoral muscle of broiler chickens and internal organs (heart, spleen, liver, the muscular part of the stomach and lungs) were not detected. According to the results of the conducted research, an adverse effect of the probiotic biopreparation at a dose of 4.0 g/10 dm3 of water on the development of microorganisms in the large pectoral muscle and internal organs of broiler chickens was established. Therefore, the probiotic “Subtiform” at a dose of 4.0 g/10 dm3 of water during the drinking of broiler chickens can be recommended to increase productivity and obtain safe slaughter products. The practical value of the work consisted of establishing the microbiological indicators of poultry slaughter products after drinking probiotics, as well as establishing safety criteria and the technological process.

Antimycotic and Antiaflatoxigenic Effect of Lactic Acid Bacteria: A Review