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Effect of a Lactococcus lactis culture supernatant on diarrhea and performance parameters of piglets in the post-weaning period and on expression of the faeG gene in vitro .
OBJECTIVES: To evaluate the effects of a cell-free supernatant from Lactococcus lactis (CFSM) on performance and diarrhearelated parameters and the presence of F4+ enterotoxigenic E. coli (ETEC) in piglets during post-weaning, and to evaluate the in vitro effect of the CFSM on faeG gene expression in an E. coli F4+.
ANIMALS AND PROCEDURE: In 3 trials with 90 piglets per trial, pigs were assigned to receive a placebo or 1 of 2 CFSM treatments and observed for diarrhea and performance. Fecal swabs were taken to determine the presence of ETEC. Quantitative RT-PCR was used to assess faeG gene expression in E. coli 21259 after treatment with CFSM at 50 mg/mL.
RESULTS: The CFSM administered for 14 d at a dose of 24 mg/kg BW (2X) reduced diarrhea-related parameters compared to the placebo. Quantitative RT-PCR showed that, in E. coli 21259 treated with CFSM at 50 mg/mL, expression of the faeG gene was significantly repressed ( P < 0.0001) relative to that in the untreated control.
CONCLUSION: The evaluated CFSM reduced the frequency and prevalence of diarrhea in a field situation. The in vitro treatment had an inhibitory effect on the expression of the faeG gene in F4+ E. coli 21259.
ANIMALS AND PROCEDURE: In 3 trials with 90 piglets per trial, pigs were assigned to receive a placebo or 1 of 2 CFSM treatments and observed for diarrhea and performance. Fecal swabs were taken to determine the presence of ETEC. Quantitative RT-PCR was used to assess faeG gene expression in E. coli 21259 after treatment with CFSM at 50 mg/mL.
RESULTS: The CFSM administered for 14 d at a dose of 24 mg/kg BW (2X) reduced diarrhea-related parameters compared to the placebo. Quantitative RT-PCR showed that, in E. coli 21259 treated with CFSM at 50 mg/mL, expression of the faeG gene was significantly repressed ( P < 0.0001) relative to that in the untreated control.
CONCLUSION: The evaluated CFSM reduced the frequency and prevalence of diarrhea in a field situation. The in vitro treatment had an inhibitory effect on the expression of the faeG gene in F4+ E. coli 21259.
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