Whole Crop Corn (WCC), Triticale (WCT) and Barley (WCB) were harvested, chopped and ensiled with urea (1 5 g kg-\\\' DM) for 45 days. pH of WCT Silage (WCTS) and WCB Silage (WCBS) was similar, but, significantly differed from WCC Silage (WCCS) (p<0.05). CrudProtein(CP) (WCCS = 67.2, WCTS = 112.4 and WCBS = 96.4 g kg-\\\' DM), Non-Protein Nitrogen (NPN), (WCCS = 6/84, WCTS = 16.85 and WCBS = 15.04 mg dI?) andNeutralDetergent Fiber (NDF), (WCCS = 436, WCTS = 497 and WCBS = 470 g kg-\\\' DM) were significantly dfferent between treatments (p<0.05). The results of the incubation of WCCS, WCTS and WCBS using nylon bag technique showed that quickly degradable fraction (a) of Dly Matter (DM) was relatively hgh for WCTS (0.37N.01) and intermedate for WCBS (0.32+0.02) andlowest for WCCS (0.24+0.01). Whereas, the slowly fraction @) forWCTS (0.44N.02) and WCBS (0.52N.04) was similar andhgher thanWCCS (0.54+0.02). The constant fractional rate of degradation (c) of CP for the silages was similar (0.02). In this experiment, the effect of replacing WCCS with WCTS or WCBS on feedng the lactating cows was also investigated. Fifteen Holstein lactating cows (37.1+4.9 kg miWd) were used in a completely randomized design for 6 weeks. Data were analyzed as repeated measures in time. Cows fed diet containing WCBS had higher feed intake than the cows of the other groups (p<0.05). Milk yield and component (protein, lactose, Urea Nitrogen (MUN) and total solid milk) were not affected significantly by the treatments. Blood glucose in mid and end of the experiment in each sampling time (0.0 and 4 h) after feedng was not affected by the treatments, but, thls metabolite decreased at the 4 h after fee&. Blood Urea Nitrogen (BUN) in the mid the (4 h) and end of the experiment (before feedng) was significantly affected by treatments (p<0.05).

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