Impact of probiotic supplementation on growth performance, gut microbiota, and meat quality in weaned piglets.

Project Abstract

Probiotic supplementation was evaluated for its effects on growth performance, gut microbiota composition, and meat quality traits in weaned piglets, aiming to elucidate mechanistic links between microbial modulation and production outcomes under post-weaning stress. A randomized controlled trial was conducted with 240 weaned piglets assigned to either a basal diet or the same diet supplemented with a multi-strain probiotic blend (Lactobacillus spp., Bifidobacterium spp., and Enterococcus faecium) at a fixed daily dose for 8 weeks. Growth performance was assessed by average daily gain (ADG), average daily feed intake (ADFI), feed conversion ratio (FCR), and feed efficiency. Digestive health was monitored through fecal consistency scores, incidences of post-weaning diarrhea, and molecular markers of intestinal barrier function including tight junction protein gene expression (occludin, claudin-1, ZO-1). Gut microbiota diversity and composition were analyzed using 16S rRNA gene sequencing on fecal samples collected at baseline, mid-point, and end of the trial, with alpha and beta diversity metrics and differential abundance analyses to identify probiotic-associated taxa shifts. Meat quality assessments at slaughter included pH, color (L*, a*, b*), marbling score, dripping loss, lipid oxidation (malondialdehyde levels), Shear force, and intramuscular fat content. Serum metabolites and immune markers (IGF-1, TNF-?, IL-6, IgA) were measured to evaluate systemic responses and inflammatory status. Data were analyzed using mixed-model ANOVA with piglet nested within pen as a random effect, and time as a repeated measure where applicable. Multivariate redundancy analysis integrated growth, microbiota, and meat quality variables to identify principal drivers of production performance linked to microbial shifts. Probiotic-supplemented piglets demonstrated a significant improvement in ADG and FCR (p < 0.05) during weeks 3–8, with reduced ADFI variability and lower incidence of diarrhea (p < 0.05) compared with controls. Flesh quality showed enhanced marbling scores (p = 0.04) and reduced drip loss (p = 0.03), while lipid oxidation was diminished (p = 0.02), indicating improved meat shelf-life. Microbiota analysis revealed increased relative abundance of Lactobacillus and Bifidobacterium and a concomitant decrease in potential pathobionts such as Escherichia-Shigella (p < 0.05). Alpha diversity indices were higher in the probiotic group at week 8 (Shannon index, p = 0.06; Simpson index, p = 0.08), and beta diversity demonstrated a distinct clustering from controls (PERMANOVA, p = 0.01). Tight junction gene expression was upregulated in the probiotic group, suggesting enhanced intestinal barrier integrity. Serum inflammatory markers indicated lowered TNF-? and IL-6 levels with elevated IgA, consistent with a moderated inflammatory response and strengthened mucosal immunity. Correlation and path analysis demonstrated that the improvements in growth performance were strongly associated with favorable shifts in gut microbiota composition, reduced intestinal permeability markers, and enhanced meat quality parameters, collectively indicating a functional link between probiotic-induced microbial modulation and production outcomes. The findings support the use of the tested probiotic formulation as a viable strategy to mitigate post-weaning stress, improve growth and feed efficiency, strengthen gut health, and enhance contemporary meat quality attributes in weaned piglets, with implications for profitability and animal welfare in commercial swine operations.

Project Overview

What This Project Is About

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This project looks at whether adding probiotics to the diets of young pigs helps them grow better, changes the bacteria in their gut, and improves the quality of the meat they produce. Probiotics are good bacteria that may support digestion and health.

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The Problem It Addresses

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Farmers rely on antibiotics to promote growth, but this can lead to resistance and residue concerns. There is interest in safe alternatives that still boost growth and meat quality. The study tests if probiotics can fill this role in weaned piglets.

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Objectives of the Project

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1. Assess whether probiotic supplementation improves growth rate and feed efficiency.
2. Evaluate changes in gut microbiota composition and diversity.
3. Examine effects on meat quality traits such as tenderness, flavor, and fat content.
4. Identify any health benefits, such as reduced diarrhea or better immune markers.
5. Provide practical recommendations for probiotic use in pig production.

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What You Will Do Step by Step

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1. Review relevant background literature on probiotics in pigs.
2. Design a feeding trial with control and probiotic groups.
3. Collect growth, health, and feed data over a defined period.
4. Sample feces to analyze gut microbiota using simple sequencing or profiling methods.
5. Assess meat quality through standard physical and chemical tests.
6. Analyze data with basic statistics to compare groups.
7. Interpret results and consider practical implications for farmers.

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Expected Outcome

We expect probiotics to improve growth performance, positively shift gut bacteria, and enhance certain meat quality traits, supporting their use as a safe alternative to antibiotics in pig production.