The aim of this study was to investigate the effects of bee pollen ethanolic extracts on the in vivo gastrointestinal tract microflora colonization of broiler chickens.
A completely randomized experiment based on six treatments (different concentrations of bee pollen - 0, 5, 15, 25, 35 and 45gkg-1 diet) was used during 7weeks. The highest count of faecal Enterococci was found in the experimental group with the addition of 15g of pollen (8.85±0.87log CFUg-1) per 1kg of feed mixture. The highest count of Lactobacilli was detected in the experimental group with 35g of pollen per 1kg of feed mixture and the highest number of the Enterobacteriaceae genera count was found in the control group (8.43±0.15log CFUg-1). Moreover, the MALDI TOF MS Biotyper identified the following genera: Escherichia coli, Proteus mirabilis, Klebsiella oxytoca, as well as Lactobacillus acidophilus, L. crispatus, L. fermentum and L. salivarius from the Lactobacilli group and Enterococcus avium, E. casseliflavus, E. cecorum, E. faecalis, E. faecium, E. gallinarum, E. hirae and E. malodoratus from the Enterococci group.
Additionally, the in vitro antimicrobial activities of pollen against five bacteria species isolated from gastrointestinal tracts of chickens were tested. The best antimicrobial effect of the pollen extract was detected against K. oxytoca.