Recently, Davis et al. (2002)
studied the possible synergistic effect when high levels
of ZnO are combined with BioMos. However, the use of
high doses of inorganic Zn has raised concern due to
elevated Zn in feces when fed for more than 10 d (Rincker et al., 2005). If the mode of action of Zn is based
on a systemic effect, an organic form of Zn with greater
bioavailability would allow reduced concentration in
feed and subsequent release in the environment while
maintaining benefits to the animals.