Digestibility of DM, Phosphorus,
and Phosphorus Excretion
Digestibility of DM and P, P excretion, and the percentage
reduction in P excretion are shown in Table 7.
There were no differences (P = 0.23) in DM digestibility
among treatments. Harper et al. (1997) and Jongbloed
et al. (1996) were also unable to demonstrate an effect
on DM digestibility as a result of supplementing weanling
and growing pig diets with phytase or phytase plus
lactic acid. Pigs fed the NC diet had a lower (P = 0.0001)
P digestibility than those fed the C diet. This is because
the inorganic P in the C diet is more digestible than
the P from plant sources in the NC diet. The diets
supplemented withMPorMP+OA had similar P digestibilities,
which were higher (P = 0.0001) than those of
the C and NC diets. Addition of phytase in the NC+MP
diet only led to a numerical reduction (P > 0.10) in the
amount of P excreted when compared to the C and NC
diets. However, with the inclusion of OA (NC+MPOA