RESUMO
This study investigated the effects of dietary Camelina sativa oilseed cake (CSC) inclusion on the meat quality and sensory traits of growing rabbits. A total of 168 crossbred 32-day-old rabbits (both sexes) were randomly allocated into three experimental groups: a Control diet (10 % rapeseed oilseed cake as main crude protein source), CS5 diet (5 % rapeseed oilseed cake and 5 % CSC), and CS10 diet (10 % CSC). After slaughter (74 days of age), longissimus lumborum (LL) muscles and hind legs (HL) were dissected and their meat were evaluated for physical traits (LL and biceps femoris; BF), sensory attributes (LL), proximate composition and fatty acid (FA) profile (whole HL). The CSC inclusion did not significantly affect physical meat traits, except for yellowness, which decreased (P < 0.05) in both BF and LL muscles. Meat water content decreased linearly with CSC inclusion (P < 0.05). The FA profile of the HL meat was modified in rabbits fed CSC-containing diet: decreased saturated FA (P < 0.001) and monounsaturated FA (P < 0.001) and increased polyunsaturated FA (P < 0.001). Omega-3 FA content linearly increased with the CSC inclusion level (P < 0.001) and, consequently, the n-6/n-3 ratio decreased (halved ratio in CS10 compared to Control; P < 0.001). The CS10 treatment had the highest fatty flavour, rancid flavour, abnormal flavour intensity, and overall flavour intensity. However, overall acceptance was not affected. These findings suggest that CSC can be a viable protein source for sustainable rabbit production and healthy meat for consumers.
RESUMO
Musculoskeletal infections (MIs) are among the most difficult-to-treat staphylococcal diseases due to antibiotic resistance. This has encouraged the development of innovative strategies, such as combination therapy, to combat MI. The aim of this study was to investigate the in vitro antistaphylococcal activity of anti-inflammatory drugs and the combined antimicrobial effect of celecoxib and oxacillin. The minimum inhibitory concentrations (MICs) of 17 anti-inflammatory drugs against standard strains and clinical isolates of S. aureus, including methicillin-resistant strains (MRSAs), were determined using the broth microdilution method. The fractional inhibitory concentration indices (FICIs) were evaluated using checkerboard assays. Celecoxib produced the most potent antistaphylococcal effect against all tested strains (MICs ranging from 32 to 64 mg/L), followed by that of diacerein against MRSA3 and MRSA ATCC 33592 (MIC 64 mg/L). Several synergistic effects were observed against the tested S. aureus strains, including MRSA (FICI ranging from 0.087 to 0.471). The strongest synergistic interaction (FICI 0.087) was against MRSA ATCC 33592 at a celecoxib concentration of 2 mg/L, with a 19-fold oxacillin MIC reduction (from 512 to 26.888 mg/L). This is the first report on the combined antistaphylococcal effect of celecoxib and oxacillin. These findings suggest celecoxib and its combination with oxacillin as perspective agents for research focused on the development of novel therapies for MI caused by S. aureus. This study further indicates that celecoxib could resensitize certain MRSA strains, in some cases, to be susceptible to ß-lactams (e.g., oxacillin) that were not previously tested. It is essential to mention that the in vitro concentrations of anti-inflammatory drugs are higher than those typically obtained in patients. Therefore, an alternative option for its administration could be the use of a drug delivery system for the controlled slow release from an implant at the infection site.