A study was made to evaluate the nutritional value of the caraway-seed pulp (CSP) in concentrate component of the diet on the performance and blood metabolite of lactating Holstein cattle . Eight Holstein cattle (mean 40 days after calving) were allocated in 4 treatments based on Latin square design experiment. The treatments offered to animals were different levels of CSP which substituted by wheat bran (WB) in concentrate by the following order:1- 0.0% CSP (100% WB- 0.0% CSP as a control group); 2- 33.3% CSP (66.7% WB,33.3% CSP); 3- 66.6% CSP (33.3% CSP+66.6% WB) and 4- 100% CSP (0.0%WB+100%CSP). Nutrient composition in CSP based of DM were, DM-37.6%, Protein-15.2%, fat-6%, NDF-55%, ADF-51% and Ash-14.5%. Overall feed intake was not statistically differ between treatments, however, numerical improvement was observed in treatment 100% CSP compared to others although the differences was not significant (P>0.05). The milk production and its composition results for all treatment was not significantly different (P>0.05). However trend was to improve in milk fat by increasing CSP levels in diet with higher rate for treatment 100% CSP. Results obtained from blood metabolite analysis indicated that concentration of glucose was higher in treatment 0.0% CSP (control) compared to others, also, serum concentrate of SGOT and SGPT trended to increase by substitution of CSP in diet (p<0.05). Rumen N-NH3 and pH was not affected by any treatments. Obtain data from this study indicated that substitution of WB by CSP had not adverse effects on dairy cattle health and performance

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