Diet ingredients and TMR samples were dried in a 55 °C forced-air oven for 72 h. Feed ingredients were analyzed for DM concentration. ground to pass through a 1 – mm screen using a Willey mill and composited by feed type on an equal mass basis. Ash concentration was determined after 5 h of oxidation at 500 °C in a muffle furnace. Concentration of NDF was determined using an Ankom Fiber Analyzer including amylase and sodium sulfite. Crude protein was determined by oxidation and detection of N2 .Crude fat was determined by ether extraction. Starch was determined by α-amylase and glucoamylase digestion, followed by colorimetric glucose quantification using a commercial kit.