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This study was conducted to investigate the milk yield and quality on lactating Holstein dairy cows fed rations including the silage made from forage rice mixed with or without phasey bean (<I>Macroptilium laghyroides</I> (L.) Urb. cv. Murray) . The milk-ripe stage rice plants (cv. Tetep) wilted for two days after harvesting were mixed with the blooming stage phasey bean (Pb) wilted for 2 - 3 hours after harvesting at the ratio of 4 : 0 or 3 : 1 in fresh matter, before being ensiled by a mini roll baler. Rations were designated as control ration, Tetep ration and Tetep+Pb ration. The control ration fed daily to a cow is composed of 26 kg of Italian ryegrass silage (Ir silage) as a roughage feed. The Tetep ration is composed of 5 kg of Tetep silage and the ration of Tetep+Pb is composed of 5 kg of Tetep+Pb silage, with 22 kg of Ir silage for each of the two rations. In addition each of daily rations includes 5-8 kg of dairy formula feed, 3 kg of alfalfa hay cubes and 1-2 kg of flaked maize. After 5 days preliminary period, the experimental period was followed. The cows were divided into two groups (2 heads/group) fed with Tetep and Tetep+Pb silage for 11 days (first term) and 7 days (second term), and all the cows were fed with control ration for 7 days during experimental periods. The results obtained were as follows. The Tetep+Pb silage showed lower fermentation quality than the Tetep silage due to a higher ratio of volatile basic nitrogen to total nitrogen (VBN/TN) . Total digestible nutrients (TDN) and crude protein (CP) contents of the Tetep+Pb silage were higher than those of the Tetep silage. This was caused by comparative high values of them in Pb (TDN; 65.0%, CP; 15.0%) . There were no significant differences in milk yield and quality between control, Tetep and Tetep+Pb rations fed to cows. The concentration of urea-N in blood plasma was higher in cows fed Tetep or Tetep+Pb rations than in cows fed the control ration. The ratio of valeric acid to total volatile fatty acids and ammonia-N concentration in rumen fluid were higher in cows fed rations Tetep or Tetep+Pb than in cows fed control ration. The above higher values detected in blood plasma and rumen fluid were within clinically normal ranges.
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