under simulated
gastrointestinal conditions.
The complexity of the intestine may lead to variations between
animals; therefore, probiotic strains may have differing
effects upon individual animals. This is a good reason for using
mixtures of strains [20]. This study identified a rather large
number of isolates from pig feces and selected some probiotic
candidates to be used in pelleted feed. In particular, L. reuteri
3S7, and L. plantarum 4.1 are: (i) naturally present at elevated
concentrations in the GIT of pigs; (ii) resistant to feed pelleting
(ca. 10 log CFU kg−1); (iii) resistant in vitro to gastric and
intestine fluids; and (iv) inhibitory, with a complementary spectrum,
toward potential pathogen bacteria.