who reported that the efficacy of mannan oligosaccharides as a
growth promoter has been demonstrated in the early
stages of the nursery period.
The processing involved in producing mannan oligosaccharides
may change the physical structure of the
cell wall in ways that change its effects, and different
sources of mannan oligosaccharides may also have
different effects on growth performance. White et al.
(2002) investigated the use of brewers dried yeast as a
source of mannan oligosaccharides in the diets provided
to young pigs. The results indicated that growth performance
was not enhanced by supplementing the basal
diet with brewers dried yeast. Pigs fed the yeast-containing
diets consumed less feed, resulting in reduced
rates of growth over the 28-d test period.