Data on fecal output, feed intake, and milk production were averaged over the 6 d of the final week of each period and
subjected to analysis of variance. All results were analyzed using the MIXED procedure of SAS (2000) within a 2
×
2 factorial
arrangement of treatments. Data on digestion, milk production, milk composition, and feed intake were analyzed using a
replicated 4
×
4 Latin square design with the general model: