• 한국축산식품학회지
• /
• 제38권1호
• /
• pp.172-179
• /
• 2018

One of the critical limitations to use of bacteriocins produced by lactic acid bacteria as a substitute for chemical antibiotics is the narrow spectrum of their antibacterial activity. The aim of present study was isolation and molecular identification of bacteriocin-producing enterococci with broad antibacterial spectrum. Bacteriocin-producing bacteria were isolated from native dairies in Kerman. Bacteriocins were purified by ammonium sulfate method and the effects of them were investigated on different strains of bacteria. Also, the effects of pH and heat on produced bacteriocins were investigated. High level bacteriocin-producing isolates were identified based on molecular tests. A total of 15 strains of bacteriocin-producing Enterococcus were isolated initially. Enterococcus faecium C-2 and Y-1 strains produced bacteriocins with the highest antibacterial effect. The bacteriocins were stable in pH ranges from 2 to 12 and their antibacterial activity was maintained after autoclave treatment. The maximum bactericidal effect was observed against Listeria monocytogenes and Pseudomonas aeruginosa. In conclusion, use of these bacteriocins as a substitute for chemical antibiotics is recommended.

• 한국생물공학회:학술대회논문집
• /
• 한국생물공학회 2005년도 생물공학의 동향(XVI)
• /
• pp.561-561
• /
• 2005

• 한국환경과학회지
• /
• 제17권2호
• /
• pp.249-255
• /
• 2008

The experiment was conducted to determine effect of the mixed herbal medicine for the substitution of antibiotics on the performance of laying hens. Day old hyline 1,500 layer chicks were randomly assigned to 4 treatments. Control were 600 chicks and there were three treatments of each 300 chicks. The 4 treatments were as follows: the mixed herbal medicine 0.1%(T-1), 0.3%(T-2) and 0.5%(T-3) after removed antibiotics on commercial feed and commercial feed( control) from 5th week to 13th week, each treatment was replicated 3 times and from 14th week to 18th week. Each 100 hens of the mixed herbal medicine 0.1%(CT-1), 0.3%(CT-2) and 0.5%(CT-3) were moved to cage. Body weight were measured on 4th, 8th, 13th week and feed intake, mortality were measured on every weeks. Body weight at fourth week, all treatments tended to be higher than control and T-3 statistically was highest(p<0.01). On 8th week, also treatments statistically high and T-1 was highest(p<0.01). But 12th week, there was not significantly different among treatments. Therefore it will be possible that the mixed herbal medicine substitute for antibiotics after vaccination. Mortality was not different between treatment and control overall rearing period. Early laying period($19{\sim}41wk$), T-2 showed highest feed intake(107.1g) among treatments, later laying period($42{\sim}77wk$), T-1 showed highest feed intake(134.3g) and was not any different among each treatments.

• 한국축산식품학회지
• /
• 제30권2호
• /
• pp.261-268
• /
• 2010

본 연구는 환경온도($21^{\circ}C$, $32^{\circ}C$) 및 항생제 대체재가 냉장저장 중 닭 가슴살의 품질에 미치는 영향을 알아보고자 실시하였다. 그 결과, 사후 72시간째 pH 값은 $32^{\circ}C$의 에션셜오일 처리구가 다른 처리구에 비해 유의적으로(p<0.05) 높게 나타났다. 황색도의 경우 $32^{\circ}C$의 고온조건에서 생산된 닭 가슴살은 $21^{\circ}C$의 조건에서 생산된 닭 가슴살에 비해 유의적으로(p<0.05) 높게 나타났다. 사후 72시간째 $32^{\circ}C$의 고온조건에서 생산된 닭 가슴살의 지방산화도는 에션셜오일 처리구에서 낮게 나타났으며, 염용성 단백질 추출성에 있어서는 약용식물 처리구에서 높게 나타나 효과적인 것으로 나타났다. 근원섬유 단백질의 분포 양상에 있어서도 액틴밴드의 경우, 유산균 및 에션셜오일 처리구가 $21^{\circ}C$의 항생제(+) 처리구와 비슷한 양상을 보였다. 이상의 결과를 종합해 볼 때 상기의 항생제 대체물질들은 항생제를 대체하더라도 저장 중 닭고기의 품질을 개선시키는 효과가 있으며, 이와 아울러 항생제 대체물 급여시 닭고기의 품질에 미치는 지표로 지방산화도 및 염용성 단백질 추출성 등이 이용될 수 있을 것으로 사료된다. 특히, 에션셜오일 급여는 고온조건에서 고품질의 닭고기를 생산할 경우 항생제 대체 효과가 가장 우수한 것으로 판단된다.

• International Journal of Internet, Broadcasting and Communication
• /
• 제14권3호
• /
• pp.171-181
• /
• 2022

Purpose: In this paper, we show our blending ratio of 10 types of Essential Oils that survives beneficial bacteria and kills harmful bacteria in the scalp, and we investigate the possibility of application of our blending ratio to the development of anti-dandruff products and the possibility of being used as a raw material for clinical beauty and customized cosmetics. Methods: The scalp microorganisms used in our study were M. furfur, S. epidermidis, E. coli, and P. nitroreducens. There are a total of 10 Essential Oils such as True Lavender, Lime, Roman chamomile, Rosemary camphor, Cedarwood, Geranium, Clove, Tea tree, Palmalosa, and Peppermint. The antibacterial test of the blended Essential Oil was carried out according to the test method of the standardized evaluation methodology of "Food and Food Additives Code". Since M. furfur is related to the growth of sebum in the scalp, in this study we used the fnLNB and the fnLNA with 20 ㎖ of whole fat cow milk added. Results: The blending ratio of EO, which inhibits dandruff-causing bacteria such as M. furfur, S. epidermidis, E. coli, and does not inhibit P. nitroreducens showing dominant growth in a healthy scalp, was B8(Clove 0.2%, Roman chamomile 0.5%, Tea tree 0.3%), B9(Geranium 0.1%, Palmarosa 0.1%, Roman chamomile 0.5%, Tea tree 0.3%), B10(Clove 0.1%, Geranium 0.1%, Palmarosa 0.1%, Roman chamomile 0.5%, Tea tree 0.2%). Conclusion: It is thought that the blending ratio of BEO obtained as a result of this study can provide a basis for use as an alternative to antibiotics in developing anti-dandruff drugs and emerge as a new alternative to solve scalp microbial imbalance. In order for EO to be used as a useful raw material for anti-dandruff preparation, researches on 1) Standardization (the effects of products differ according to the types, regions, climate, extraction methods, etc.), 2) Antimicrobial effects, 3) Safety, etc., must be established.

• Asian-Australasian Journal of Animal Sciences
• /
• 제22권8호
• /
• pp.1202-1208
• /
• 2009

Synbiotics is the term used for a mixture of probiotics (live microbial feed additives that beneficially affects the host animal) and prebiotics (non-digestible food ingredients that beneficially affect the organism). This study investigated the effect of probiotics from anaerobic microflora with prebiotics on growth performance, nutrient digestibility, noxious gas emission and fecal microbial population in weaning pigs. 150 pigs with an initial BW of 6.80${\pm}$0.32 kg (20 d of age) were randomly assigned to 5 dietary treatments as follows: i) US, basal diet+0.15% antibiotics (0.05% oxytetracycline 200 and 0.10% tiamulin 38 g), ii) BS, basal diet+0.2% synbiotics (probiotics from bacteria), iii) YS, basal diet+0.2% synbiotics (probiotics from yeast), iv) MS, basal diet+0.2% synbiotics (probiotics from mold), v) CS, basal diet+0.2% synbiotics (from compounds of bacteria, yeast and mold). The probiotics were contained in $10^{9}$ cfu/ml, $10^{5}$ cfu/ml and $10^{3}$ tfu/ml of bacteria, yeast and molds, respectively. The same prebiotics (mannan oligosaccharide, lactose, sodium acetate and ammonium citrate) was used for all the synbiotics. Pigs were housed individually for a 16-day experimental period. Growth performance showed no significant difference between antibiotic treatments and synbiotics-added treatments. The BS treatment showed higher (p<0.05) dry matter (DM) and nitrogen digestibility while ether extract and crude fiber digestibility were not affected by the dietary treatment. Also, the BS treatment decreased (p<0.05) fecal ammonia and amine gas emissions. Hydrogen sulfide concentration was also decreased (p<0.05) in BS, YS and MS treatments compared to other treatments. Moreover, all the synbioticsadded treatments increased fecal acetic acid concentration while the CS treatment had lower propionic acid concentration than the US treatment (p<0.05) gas emissions but decreased in fecal propionate gas emissions. Total fecal bacteria and Escherichia coli populations did not differ significantly among the treatments, while the Shigella counts were decreased (p<0.05) in synbiotics-included treatment. Fecal bacteria population was higher in the YS treatment than other treatments (p<0.05). The BS treatment had higher yeast concentration than YS, MS and CS treatments, while US treatment had higher mold concentrations than MS treatment (p<0.05). Therefore, the results of the present study suggest that synbiotics are as effective as antibiotics on growth performance, nutrient digestibility and fecal microflora composition in weaning pigs. Additionally, synbiotics from anaerobic microflora can decrease fecal noxious gas emission and synbiotics can substitute for antibiotics in weaning pigs.

• 한국미생물·생명공학회지
• /
• 제36권2호
• /
• pp.87-95
• /
• 2008

생균제는 충분하고도 적절하게 사용되었을 때 숙주의 건강에 도움이 될 수 있는 살아있는 미생물이다. Lactobacilli나 Bacillus와 같은 직접투여하는 미생물 (DFM)은 생장을 촉진하기 위하여 사료에 첨가되는 항생제 혹은 식품첨가물보다 장내의 정상균총의 정착에 매우 긍정적인 효과를 보여줄 수 있다. 또한, 생균제가 투여됨으로 해서 면역체계가 강화되고, 감염에 대한 예방효과가 있는데 이는 동물 체내에 병원균이 정착하는 것을 방해함으로서 이러한 효과를 기대할 수 있다. 생균제 투여를 통해 얻을 수 있는 효과는 배설물의 분해를 촉진하여 악취를 저감시켜줌으로서 가축의 사육환경을 개선할 수 있다는 점이다. 최근 들어, 환경보호와 안전한 먹거리에 대한 새로운 패러다임이 정착됨에 따라, 환경을 개선하고 우수한 품질의 축산품을 생산하기 위해 가축농가에서는 기존의 항생제를 대체할 수 있는 대안으로서의 생균제에 대한 요구가 높아지고 거의 모든 농가에서 생균제를 사용하고 있다고 해도 무리가 없다. 국내에서 유통되는 생균제는 크게 세부류이다. 첫째는 국립수의과학독성원(NVRQS)에 의해 검증되고 약사법에 의해 관리를 받는 동물의약품으로서의 생균제, 둘째는 시군에서 등록이되는 보조사료로서의 생균제와 마지막으로 미등록된 환경개선제들이다. 그러나, 많은 검증받지 않은 제품이 유통되고 생산됨으로 인해 이를 검증할 방안마련이 시급한 실정이다. 본 연구에서는 환경개선제로서의 생균제를 검증하기 위한 방안으로, 생균수의 검증, 항생제 내성 검증, 그리고 악취제거능에 대한 검증의 3단계 방법을 제안한다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제27권1호
• /
• pp.93-100
• /
• 2014

The banning of the use of antibiotics as feed additive has accelerated investigations of alternative feed additives in animal production. This experiment investigated the effect of pure citric acid or acidifier blend supplementation as substitute for antibiotic growth promoters on growth performance, fecal microbial count, and humoral immunity in weaned piglets challenged with Salmonella enterica serover Typhimurium and Escherichia coli KCTC 2571. A total of 60 newly weaned piglets (crossbred, 28-d-old; average 8 kg initial weight) were randomly assigned to four dietary treatments in a completely randomized design. Dietary treatments included NC (negative control; basal diet), PC (positive control; basal diet+0.002% apramycin), T1 (basal diet+0.5% pure citric acid), and T2 (basal diet+0.4% acidifier blend). All piglets were orally challenged with 5 mL of culture fluid containing $2.3{\times}10^8$ cfu/mL of E. coli KCTC 2571 and $5.9{\times}10^8$ cfu/mL of S. typhimurium at the beginning of the experiment. The PC group showed the highest ADG and ADFI, whereas gain:feed was improved in the PC and T1 group (p<0.05). All dietary treatments showed significant reduction in fecal counts of Salmonella and E. coli, compared to NC (p<0.05), with PC being better than T1 and T2. Significant elevation in fecal Lactobacillus spp. counts was shown by treatments with T1, T2, and PC, whereas Bacillus spp. counts were increased by treatment with T1 and T2 compared to NC and PC diet (p<0.05). Serum IgG concentration was increased by T1 diet (p<0.05), whereas IgM and IgA were not significantly affected by any of the dietary treatments (p>0.05). From these above results, it can be concluded that, as alternatives to antibiotics dietary acidification with pure citric acid or acidifiers blend did not fully ameliorate the negative effects of microbial challenges in respect of growth performance and microbial environment, however improved immunity suggested further research with different dose levels.

• Asian-Australasian Journal of Animal Sciences
• /
• 제17권8호
• /
• pp.1139-1144
• /
• 2004

In Exp. 1, a total of 36 pigs (6.55$\pm$0.10 kg average initial body weight and 21 d average age) were used in a 14 d growth study to determine the effects of replacing spray-dried plasma protein (SDPP) with spray-dried egg protein containing specific egg yolk antibody (SDEP) on growth performance and nutrient digestibility in weaned pigs. The pigs were blocked by weight and assigned to treatments based on sex. There were three pigs per pen and four pens per treatment. Dietary treatments were 0, 3, or 6% SDEP and contained 6, 3, or 0% SDPP, respectively. Through the entire experimental period, average daily gain (ADG), average daily feed intake (ADFI), and gain/feed tended to decrease as the concentration of SDEP increased in the diets. However, there were no significant differences among the treatments (p>0.05). As the addition of SDEP in the diets increased, apparent digestibilities of dry matter (DM) and nitrogen (N) were decreased without significant (p>0.05). For Exp. 2, 36 pigs (2.63$\pm$0.04 kg average initial body weight and 10 d average age) were used in a 14 d growth study to determine the effects of antibiotic replacement with SDEP on growth performance and nutrient digestibility in early-weaned pigs. The pigs were blocked by weight and assigned to treatments based on sex. There were three pigs per pen and four pens per treatment. Dietary treatments included 1) ANTIBIOTIC (corn-dried whey-soybean meal based diet+0.08% antibiotics, 4 mg of tiamuline hydrogen fumarate; 10 mg of sulfadimidine per kg of complete diet), 2) SDEP0.1 (corndried whey-SBM based diet+0.1% SDEP), and 3) SDEP0.2 (corn-dried whey-SBM based diet+0.2% SDEP). ADG and gain/feed of pigs fed the SDEP0.2 diet were higher than for pigs fed the ANTIBIOTIC diet without significant (p>0.05). Pigs fed the diet with SDEP0.2 tended to have increased apparent digestibilities of DM and N compared to pigs fed the ANTIBIOTIC diet without significant (p>0.05). In conclusion, the dietary SDEP seemed to be partial replacing the SDPP portion of high nutrient dense diet for weaned pigs. Also, dietary SDEP seemed to be approximately 0.2% or more when the pigs fed the antibiotic-free diet for early-weaned pigs.

• Journal of Microbiology and Biotechnology
• /
• 제25권12호
• /
• pp.2082-2089
• /
• 2015

Avian beta-defensin 9 (AvBD9) is a small cationic peptide consisting of 41 amino acids that plays a crucial rule in innate immunity and acquired immunity in chickens. Owing to its wide antibacterial spectrum, lack of a residue, and failure to induce bacterial drug resistance, AvBD9 is expected to become a substitute for conventional antibiotics in the livestock and poultry industries. Using the preferred codon of Pichia pastoris, the mature AvBD9 peptide was designed and synthesized, based on the sequence from GenBank. The P. pastoris constitutive expression vector pGHKα was used to construct a pGHKα-AvBD9 recombinant plasmid. Restriction enzyme digestion was performed using SacI and BglII to remove the ampicillin resistance gene, and the plasmid was electrotransformed into P. pastoris GS115. High-expression strains with G418 resistance were screened, and the culture supernatant was analyzed by Tricine-SDS-PAGE and western blot assay to identify target bands of about 6 kDa. A concentrate of the supernatant containing AvBD9 was used for determination of antimicrobial activity. The supernatant concentrate was effective against Escherichia coli, Salmonella paratyphi, Salmonella pullorum, Pseudomonas aeruginosa, Enterococcus faecalis, and Enterobacter cloacae. The fermentation product of P. pastoris carrying the recombinant AvBD9 plasmid was adjusted to 1.0 × 10⁸ CFU/ml and added to the drinking water of white feather broilers at different concentrations. The daily average weight gain and immune organ indices in broilers older than 7 days were significantly improved by the AvBD9 treatment.