4. Discussion
Several feeding trials have been conducted to evaluate
the effects of BioPlus 2B® in pig diets. Previous studies
have suggested that supplementation of the diets of
nursery pigs with BioPlus 2B® did not improve the
growth performance (Kritas and Morrison, 2004; Min
et al. 2004), however, these results have not always been
consistent. For example, Gracia et al. (2004) reported that
dietary 0.04%BioPlus 2B® could benefit ADG and ADFI
during the prestarter period and the overall prestarter–
finishing period. Similarly, Munoz et al. (2007) suggested
that addition of 0.05%BioPlus 2B® to the diet of finishing
pigs improved ADFI, but had no effect on ADG or the G:
F ratio. The variation in the results of these studies can be
ascribed to several factors, including the age of the pigs,
the dose of BioPlus 2B®, diet composition, feed form and
interaction with other dietary feed additives (Chesson