The current study was undertaken to determine the feeding value of the whole-plant barley silage harvested at dough stage (BDS), barley silage harvested at ripening stage (BRS) and barley pellet (BP) as a roughage source for milking cows compared with corn silage (CS) and hay. Sixteen lactating cows (613.8㎏) producing 21.3㎏ of milk daily were alloted into four treatments. Digestrbility of various nutrients contained in three silages and one pellet, volatile fatty acid (VFA) concentration in rumen fluid after feeding these silages and pellet were investigated using twelve Corriedale rams. The results obtained were summarized as follows: 1. Milk production was significantly (P$lt;0.05) higher in BP group (21.24㎏) and BDS group (19.48㎏) than CS group (17.37㎏) and BRS group (17.80㎏). 2. There was no significant effects of diet on milk fat, but milk protein content was significantly higher (P$lt;0.05) in CS group and BRS group than BP group and BDS group. Lactose content was significantly increased (P$lt;0.05) when CS was fed compared with BDS group. 3. Differences in feed intake between CS group and the other groups were not significant. 4. Corn silage tended to increase body weight gain over other treatments, but there was no significant difference between four treatments. 5. The apparent digestibilities of roughage dry matter (DM) and crude protein were not different among treatment groups. 6. Ruminal total VFA production, molar percentage of rumen acetate, propionate, isovalerate were significantly higher (P$lt;0.05) in BRS group, but butyrate and valerate were not significant. 7. The feed cost far producing 1㎏ milk was estimated as ￦146 in CS group and ￦119 in BDS group. Higher net income (￦1486/head) was made in BP group.