Piglets are highly susceptible to fumonisin B1 (FB1) toxicity. The study aimed to investigate the influence of probiotic Levilactobacillus brevis (L. brevis) on growth performance, body weight gain (BWG) and feed conversion ratio (FCR) of weaned piglets under FB1 challenges. Twenty-six piglets with an initial body weight of 11.03 ± 1.32 kg were randomly assigned to four dietary treatment groups for 28 days: control (C, commercial diet), control feed supplemented with individual probiotic L. brevis (Lb), 50 ppm FB1 -contaminated control diet (F), and 50 ppm FB1-contaminated control diet supplemented with L. brevis (FLb). Individual FI was recorded daily while body weight was weekly. Statistical analysis was conducted using the R program (R 4.4.1) to test for normality, then T-test and Wilcoxon tests depending on the distribution. Results showed no significant difference in the FI of different groups, but pigs in F groups had somewhat lower gain and higher FCR than the pigs in C treatment (p>0.05). A combination of L. brevis with FB1 showed a significant reduction in BWG and an increase in FCR at the end of the supplemental period compared to all treatments (p < 0.05) suggesting a complex interaction. These are preliminary findings, further histological, biochemical and microbiota analysis will elucidate the mechanisms underlying the complex interactions affecting growth performance.

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