No abstract

The objective of this research was to evaluate four diets that were applied in lactating dairy cows. The diests were forage and rice bran (RB), forage and a combination of fermented cassava (1.7kg/d) and C. xanthorhiza liquid (0.7kg/d) (FCC), forage and Tabut block (6 blocks/d) (TB), and forage and lactating concentrate (2kg/d) containing C. xanthorhiza and yeast (LC). The last three treatments containing yeast or fermented cassava and C. xanthorhiza were based on the results of previous researches. These treatments were provided accordingly in Latin Square 4 x 4 arrangements in four lactating dairy cows during four-10 days/period. Results showed that dry matter intakes were low in averages of RB (14.34 kg/d) and TB (15.45 kg/d) diets. However, the milk yields were slightly higher in the RB (5.53 kg/d), while in TB diet was low (5.0 kg/d). Milk fat (4.08 %) and milk protein (4.36%) were found high in TB diet. Economically, feed cost of RB and TB diets were low. Since the milk production of the RB diet was high, therefor its milk revenue (Rp. 38,710/d) and milk income over feed cost or MIOFC (Rp. 22,710/d) were high with low feed cost (Rp. 16,000/d). Among the last three diets, the TB diet showed low total feed cost (Rp. 18,564/d ) and slightly high MIOFC (Rp. 16,436/d). It can be concluded that diet containing forage and Tabut block was considered optimal in terms of milk production, milk quality and MIOFC.