This experiment was conducted to evaluate the effect of microbial inoculants on the nutritive value of corn silage for lactating dairy cows. Whole crop corn forage from the same field was harvested at milk stage of maturity (210 g/kg dry matter, DM) and stored in bunker silos. Approximately 60 tones of forage were made for each treatment. Treatments were made in the following order:1) untreated (control), 2) inoculant A (Ecosyl®, Ecosyl Products Ltd. Stokesley, UK) 3) inoculant B (Biotal®, Lallemand Animal Nutrition, France), 4) combination of inoculants A plus B. Inoculants were mixed in water and applied according to the label instructions to supply 1 x 10 5 cfu of lactic acid bacteria/g of silage. This experiment was conducted as duplicated 4 × 4 Latin square design (21-d periods). In this study, used of 8 multiparous high performance Holstein-cows (average 100 + 20 days in milking and 650 kg body weight). The effect of treatments on end products of fermentation was not significant and treatments dose not an effect on DM, OM , WSC, NDF, ADF and Cp of silage. Dry matter intake (Kg/d), digestibility of DM, OM , NDF and ADF, ruminal pH and ruminal volatile fatty acid (m mol/100m mol of fatty acid) were not affected by these treatments. Effects of treatments on milk yield, Fat corrected milk yield, energy corrected milk yield, milk fat and protein content, percentage of milk fat and protein and milk yield efficiency was not affected by treatments. In this experiment microbial inoculants did not improve the nutritive value of low dry matter corn silage for lactating dairy cows.
