Nine multiparous cows were fed diets containing gelatinized anionic salts to determine the effects of acidified diet on dry matter intake (DMI), urinary pH, and serum parameters. Dietary cation-anion difference (DCAD) for precalving diets was approximately +10, -2, and -10 meq/100 g DM, respectively. There were no differences on DMI of cows fed the acidified diet compared with DCAD+10 (P>0.05). Mean serum Ca concentrations were increased for cows fed the DCAD-10 diet (P<0.0001). Urinary pH of cows fed DCAD-2 and DCAD-10 diets were decreased compared with DCAD+10 (P<0.0001). These data indicate that a diet based on reed hay and maize silage supplemented with gelatinized anionic salts with a DCAD value -10 meq/100 g DM is suitable for prepartum dairy cows.