2.7. Statistical analysis
The data from Exps. 1 and 2 were tested for the linear and
quadratic effects of phytase inclusion using the General Linear
Model Procedure (Proc GLM) of SAS (SAS Inst. Inc., Cary, NC).
For the weaner performance analysis, the pen served as the
experimental unit, and for the finisher performance analysis,
the individual pig served as the experimental unit. Initial pig
BW was included as a covariate in the model for the weaner
performance analysis. The bone data were adjusted for
slaughter weight by covariance analysis at the end of both
the weaner and finisher stages. Treatment means and
associated standard errors were separated by the least square
means statement and the PDIFF option. The data are
presented as least square means±SE. Significant differences
were accepted if Pb0.05.