Statistical Analysis
Data were analyzed using GLM procedures of SAS (1998) for a completely randomized design. Treatment means were compared using the PDIFF statement of SAS when protected by a significant (P < 0.10) F value. Pen served as the experimental unit for all analyses.
Research animal care protocols for both experiments followed guidelines recommended in the Guide for the Care and Use of Agricultural Animals in Agriculture Research and Teaching (Consortium, 1988).