SB incorporated into milk replacer (Galvao et al., 2005) improved dry matter (DM)
intake, while addition of SC to a dairy calf starter (Lesmeister et al., 2004) increased
DM intake and growth, but did not impact rumen development. Oeztuerk et al. (2005)
reported that addition of live and autoclaved SB stimulated in vitro ruminal microbial
metabolism, with only small differences between treatments, and concluded that ruminal microbes digested SB as a substrate rather than utilizing it as a probiotic. However, effects of SB might extend beyond the rumen, because a number of yeast cells remain alive during transit through the digestive tract