The probiotic preparation used in the current experiment is manufactured by Chr. Hansen A/S (Hørsholm, Denmark)under the name of BioPlus YC®. The product comprises a mixture of spray-dried spore-forming Bacillus licheniformis (DSM5749) and Bacillus subtilis (DSM 5750) at a minimum concentration of 3.2 × 109viable spores/g of product.