Antimicrobial activity of palm oils rich in medium-chain fatty acids against grampositive mastitis-causatives in dairy cattle: in vitro study
The causative agents of bovine mastitis are usually ubiquitous gram-positive bacteria of the genera Streptococcus, Staphylococcus, Escherichia, etc. In addition to the unquestionable threat posed by these bacteria in cattle breeding, their other danger is related to humans, especially due to their very high resistance to disinfectants and antibiotic. This resistance is further spread into the environment. Reducing resistance is possible in several ways. The use of alternative disinfectants and antimicrobials is offered. These include oils rich in medium-chain fatty acids (MCFAs), which are known for their antibacterial activity and can serve as a substitute for antiseptics and antibiotics. Coconut, palm and tucuma oil are common ingredients of+ human and animal nutrition. Therefore, the aim of this study was to evaluate the in vitro by microdilution broth method the inhibitory activity of MCFA-rich palm oils after cleavage by exogenous Mucor javanicus lipase against five strains of gram-positive bacterial pathogens that have been proven to cause mastitis in dairy cattle (Staphylococcus aureus and Streptocoecus agalactiae). The tested palm oils showed an inhibitory effect against the growth of all tested bacterial strains in the range of 64–8192 μl/ml. Str. agalactiae has been identified as a more sensitive species compared to S. aureus. The results of this study suggest that MCFA-rich palm oils may serve as an alternative approach to “predip” and “postdip” farm practices, as a control mechanism for the prevention of bovine mastitis. However, further in vivo studies are needed to confirm the potential practical use of MCFA-rich palm oils.
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