Antimicrobial resistance in beef feedlot manure as impacted by forage concentration and essential oil in finishing cattle diets

Chicken meat, which could be a healthy and nutritionally food, is regrettably incriminated as a source of Salmonella typhimurium which has a great ability to cause human salmonellosis. This study aimed to assess the prevalence of multidrug-resistant S. typhimurium in chicken meat and the effects of essential oils on its viability. A total of 300 chicken meat and its products samples were streaked on XLD agar plates, which was followed by identification of the isolates based on biochemical and serological tests. Ten isolates were serotyped as S. typhimurium then assayed for susceptibility to 14 antimicrobials by the single diffusion method. Eight isolates (80%) showed multiple antimicrobial resistance (MAR) for 3 or more antimicrobials with MAR index of 0.4857 in average. Serotyped S. typhimurium strain with the highest antimicrobial resistance, confirmed by 16s RNA sequencing, was selected for studying the effects of thyme, oregano, and lemon essential oils with concentrations of 0.5, and 1% on its viability after inoculating into chicken fillets by intensity of 3.0×106 and on sensory traits of chicken fillets on 2nd, 4th, 6th, and 8th days of inoculation during cold storage (4ºC). All results showed a significant reduction of S. typhimurium counts with highest inhibition obtained using 1% lemon essential oil. The sensory properties of treated chicken fillets were improved by all used essential oils, compared to the control samples after 6th day, and 8th day of the storage period. The samples treated with 0.5, and 1% lemon essential oil revealed the highest improvement of sensory attributes. This study proved that the majority of S. typhimurium existing in chicken meat are Multidrug-resistant and have no negative effect on sensory traits, hence, posing a public health hazard. Natural essential oils have, also, great antimicrobial effect on S. typhimurium, thus it could replace chemical antimicrobials.

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66 Effect of essential oil and exogenous enzyme on performance and carcass traits of finishing cattle fed different roughage sources.

Journal of Animal Science ◽

10.1093/jas/sky404.866 ◽

2018 ◽

Vol 96 (suppl_3) ◽

pp. 394-395

Author(s):

T Sabella Acedo ◽

R Goulard ◽

V Nunes de Gouvea ◽

T Sabella Acedo ◽

G de Souza Floriano Machado de Vasconcellos ◽

...

Keyword(s):

Essential Oil ◽

Carcass Traits ◽

Finishing Cattle ◽

Exogenous Enzyme

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Combination Therapy Involving Lavandula angustifolia and Its Derivatives in Exhibiting Antimicrobial Properties and Combatting Antimicrobial Resistance: Current Challenges and Future Prospects

Processes ◽

10.3390/pr9040609 ◽

2021 ◽

Vol 9 (4) ◽

pp. 609

Author(s):

Wye-Hong Leong ◽

Kok-Song Lai ◽

Swee-Hua Erin Lim

Keyword(s):

Antimicrobial Activity ◽

Antimicrobial Resistance ◽

Essential Oil ◽

Antimicrobial Agents ◽

Synergistic Effects ◽

Antimicrobial Properties ◽

Multidrug Resistant ◽

Antimicrobial Effects ◽

Insight Into

Antimicrobial resistance (AMR) has been identified as one of the biggest health threats in the world. Current therapeutic options for common infections are markedly limited due to the emergence of multidrug resistant pathogens in the community and the hospitals. The role of different essential oils (EOs) and their derivatives in exhibiting antimicrobial properties has been widely elucidated with their respective mechanisms of action. Recently, there has been a heightened emphasis on lavender essential oil (LEO)’s antimicrobial properties and wound healing effects. However, to date, there has been no review published examining the antimicrobial benefits of lavender essential oil, specifically. Previous literature has shown that LEO and its constituents act synergistically with different antimicrobial agents to potentiate the antimicrobial activity. For the past decade, encapsulation of EOs with nanoparticles has been widely practiced due to increased antimicrobial effects and greater bioavailability as compared to non-encapsulated oils. Therefore, this review intends to provide an insight into the different aspects of antimicrobial activity exhibited by LEO and its constituents, discuss the synergistic effects displayed by combinatory therapy involving LEO, as well as to explore the significance of nano-encapsulation in boosting the antimicrobial effects of LEO; it is aimed that from the integration of these knowledge areas, combating AMR will be more than just a possibility.

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