Effect of fat level and fatty acid profile (experiment 3; Harvatine and Allen, 2006) on feed intake (A), rumination (B), and rumen pH (C). CON = no-supplement control; SFA = prilled saturated fatty acid supplement (Energy Booster-100, Milk Specialties Inc., Eden Prairie, MN); UFA = calcium salts of unsaturated fatty acids (Megalac-R, Church and Dwight Co. Inc., Ewing, NJ), and MIX = 50:50 mixture of SFA and UFA. The effect of time, fatty acid supplement, and their interaction and the pooled SEM are reported in each panel. Cows were fed 1×/d at 0900 h.